diff --git a/package-lock.json b/package-lock.json
index 4afd04fd..e4980605 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,2172 +1,54 @@
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+            "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.47.0.tgz",
+            "integrity": "sha512-QBmA/G2y+IfeS4oktet3qRZ+P5kPhCKRXxXnQEudYqUaEioAU1/Lq2us3D/t1Jfo4hE9REQPrbB7K5sOczJVIw=="
         },
         "mime-types": {
-            "version": "2.1.27",
-            "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.27.tgz",
-            "integrity": "sha512-JIhqnCasI9yD+SsmkquHBxTSEuZdQX5BuQnS2Vc7puQQQ+8yiP5AY5uWhpdv4YL4VM5c6iliiYWPgJ/nJQLp7w==",
+            "version": "2.1.30",
+            "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.30.tgz",
+            "integrity": "sha512-crmjA4bLtR8m9qLpHvgxSChT+XoSlZi8J4n/aIdn3z92e/U47Z0V/yl+Wh9W046GgFVAmoNR/fmdbZYcSSIUeg==",
             "requires": {
-                "mime-db": "1.44.0"
+                "mime-db": "1.47.0"
             }
         },
         "mimic-fn": {
@@ -3039,9 +890,9 @@
             "integrity": "sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw=="
         },
         "moment": {
-            "version": "2.27.0",
-            "resolved": "https://registry.npmjs.org/moment/-/moment-2.27.0.tgz",
-            "integrity": "sha512-al0MUK7cpIcglMv3YF13qSgdAIqxHTO7brRtaz3DlSULbqfazqkc5kEjNrLDOM7fsjshoFIihnU8snrP7zUvhQ=="
+            "version": "2.29.1",
+            "resolved": "https://registry.npmjs.org/moment/-/moment-2.29.1.tgz",
+            "integrity": "sha512-kHmoybcPV8Sqy59DwNDY3Jefr64lK/by/da0ViFcuA4DH0vQg5Q6Ze5VimxkfQNSC+Mls/Kx53s7TjP1RhFEDQ=="
         },
         "mute-stream": {
             "version": "0.0.8",
@@ -3208,9 +1059,9 @@
             "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
         },
         "path-parse": {
-            "version": "1.0.6",
-            "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.6.tgz",
-            "integrity": "sha512-GSmOT2EbHrINBf9SR7CDELwlJ8AENk3Qn7OikK4nFYAu3Ote2+JYNVvkpAEQm3/TLNEJFD/xZJjzyxg3KBWOzw==",
+            "version": "1.0.7",
+            "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.7.tgz",
+            "integrity": "sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==",
             "dev": true
         },
         "performance-now": {
@@ -3335,11 +1186,12 @@
             "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg=="
         },
         "resolve": {
-            "version": "1.10.0",
-            "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.10.0.tgz",
-            "integrity": "sha512-3sUr9aq5OfSg2S9pNtPA9hL1FVEAjvfOC4leW0SNf/mpnaakz2a9femSd6LqAww2RaFctwyf1lCqnTHuF1rxDg==",
+            "version": "1.20.0",
+            "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.20.0.tgz",
+            "integrity": "sha512-wENBPt4ySzg4ybFQW2TT1zMQucPK95HSh/nq2CFTZVOGut2+pQvSsgtda4d26YrYcr067wjbmzOG8byDPBX63A==",
             "dev": true,
             "requires": {
+                "is-core-module": "^2.2.0",
                 "path-parse": "^1.0.6"
             }
         },
@@ -3387,9 +1239,9 @@
             "integrity": "sha1-8MgtmKOxOah3aogIBQuCRDEIf8o="
         },
         "semver": {
-            "version": "5.6.0",
-            "resolved": "https://registry.npmjs.org/semver/-/semver-5.6.0.tgz",
-            "integrity": "sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg==",
+            "version": "5.7.1",
+            "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+            "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
             "dev": true
         },
         "set-blocking": {
@@ -3434,11 +1286,6 @@
             "resolved": "https://registry.npmjs.org/stack-trace/-/stack-trace-0.0.10.tgz",
             "integrity": "sha1-VHxws0fo0ytOEI6hoqFZ5f3eGcA="
         },
-        "string_decoder": {
-            "version": "0.10.31",
-            "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-            "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ="
-        },
         "string-width": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
@@ -3454,6 +1301,11 @@
             "resolved": "https://registry.npmjs.org/string.fromcodepoint/-/string.fromcodepoint-0.2.1.tgz",
             "integrity": "sha1-jZeDM8C8klOPUPOD5IiPPlYZ1lM="
         },
+        "string_decoder": {
+            "version": "0.10.31",
+            "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+            "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ="
+        },
         "strip-ansi": {
             "version": "3.0.1",
             "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
@@ -3493,29 +1345,41 @@
             "optional": true
         },
         "tslib": {
-            "version": "1.9.3",
-            "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
-            "integrity": "sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ==",
+            "version": "1.14.1",
+            "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+            "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
             "dev": true
         },
         "tslint": {
-            "version": "5.12.1",
-            "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.12.1.tgz",
-            "integrity": "sha512-sfodBHOucFg6egff8d1BvuofoOQ/nOeYNfbp7LDlKBcLNrL3lmS5zoiDGyOMdT7YsEXAwWpTdAHwOGOc8eRZAw==",
+            "version": "5.20.1",
+            "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.20.1.tgz",
+            "integrity": "sha512-EcMxhzCFt8k+/UP5r8waCf/lzmeSyVlqxqMEDQE7rWYiQky8KpIBz1JAoYXfROHrPZ1XXd43q8yQnULOLiBRQg==",
             "dev": true,
             "requires": {
-                "babel-code-frame": "^6.22.0",
+                "@babel/code-frame": "^7.0.0",
                 "builtin-modules": "^1.1.1",
                 "chalk": "^2.3.0",
                 "commander": "^2.12.1",
-                "diff": "^3.2.0",
+                "diff": "^4.0.1",
                 "glob": "^7.1.1",
-                "js-yaml": "^3.7.0",
+                "js-yaml": "^3.13.1",
                 "minimatch": "^3.0.4",
+                "mkdirp": "^0.5.1",
                 "resolve": "^1.3.2",
                 "semver": "^5.3.0",
                 "tslib": "^1.8.0",
-                "tsutils": "^2.27.2"
+                "tsutils": "^2.29.0"
+            },
+            "dependencies": {
+                "mkdirp": {
+                    "version": "0.5.5",
+                    "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+                    "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+                    "dev": true,
+                    "requires": {
+                        "minimist": "^1.2.5"
+                    }
+                }
             }
         },
         "tsutils": {
@@ -3550,9 +1414,9 @@
             }
         },
         "typescript": {
-            "version": "2.9.2",
-            "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.9.2.tgz",
-            "integrity": "sha512-Gr4p6nFNaoufRIY4NMdpQRNmgxVIGMs4Fcu/ujdYk3nAZqk7supzBE9idmvfZIlH/Cuj//dvi+019qEue9lV0w==",
+            "version": "4.3.2",
+            "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.2.tgz",
+            "integrity": "sha512-zZ4hShnmnoVnAHpVHWpTcxdv7dWP60S2FsydQLV8V5PbS3FifjWFFRiHSWpDJahly88PRyV5teTSLoq4eG7mKw==",
             "dev": true
         },
         "uc.micro": {
@@ -3566,22 +1430,22 @@
             "integrity": "sha512-5/4etnCkd9c8gwgowi5/om/mYO5ajCaOgdzj/oW+0eQV9WxKBDZw5+ycmKmeaTXjInS/W0BzpGLo2xR2aBwZdg=="
         },
         "unescape-js": {
-            "version": "1.1.1",
-            "resolved": "https://registry.npmjs.org/unescape-js/-/unescape-js-1.1.1.tgz",
-            "integrity": "sha512-2/6CdybfFt9fzYJhCD6SHfBnqCGNfjhMwPK9Pf+sJRloa/WmyAmxdBVOslOIYkvSIRKX+9xGePF5t1tugtZ63g==",
+            "version": "1.1.4",
+            "resolved": "https://registry.npmjs.org/unescape-js/-/unescape-js-1.1.4.tgz",
+            "integrity": "sha512-42SD8NOQEhdYntEiUQdYq/1V/YHwr1HLwlHuTJB5InVVdOSbgI6xu8jK5q65yIzuFCfczzyDF/7hbGzVbyCw0g==",
             "requires": {
                 "string.fromcodepoint": "^0.2.1"
             }
         },
         "universalify": {
-            "version": "0.1.2",
-            "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
-            "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.0.tgz",
+            "integrity": "sha512-hAZsKq7Yy11Zu1DE0OzWjw7nnLZmJZYTDZZyEFHZdUhV8FkH5MCfoU1XMaxXovpyW5nq5scPqq0ZDP9Zyl04oQ=="
         },
         "uri-js": {
-            "version": "4.2.2",
-            "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
-            "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+            "version": "4.4.1",
+            "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+            "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
             "requires": {
                 "punycode": "^2.1.0"
             }
@@ -3745,14 +1609,14 @@
             "optional": true
         },
         "y18n": {
-            "version": "3.2.1",
-            "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
-            "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
+            "version": "3.2.2",
+            "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.2.tgz",
+            "integrity": "sha512-uGZHXkHnhF0XeeAPgnKfPv1bgKAYyVvmNL1xlKsPYZPaIHxGti2hHqvOCQv71XMsLxu1QjergkqogUnms5D3YQ=="
         },
         "yargs": {
-            "version": "15.3.1",
-            "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.3.1.tgz",
-            "integrity": "sha512-92O1HWEjw27sBfgmXiixJWT5hRBp2eobqXicLtPBIDBhYB+1HpwZlXmbW2luivBJHBzki+7VyCLRtAkScbTBQA==",
+            "version": "15.4.1",
+            "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
+            "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
             "requires": {
                 "cliui": "^6.0.0",
                 "decamelize": "^1.2.0",
@@ -3764,7 +1628,7 @@
                 "string-width": "^4.2.0",
                 "which-module": "^2.0.0",
                 "y18n": "^4.0.0",
-                "yargs-parser": "^18.1.1"
+                "yargs-parser": "^18.1.2"
             },
             "dependencies": {
                 "ansi-regex": {
@@ -3773,11 +1637,10 @@
                     "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg=="
                 },
                 "ansi-styles": {
-                    "version": "4.2.1",
-                    "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.2.1.tgz",
-                    "integrity": "sha512-9VGjrMsG1vePxcSweQsN20KY/c4zN0h9fLjqAbwbPfahM3t+NL+M9HC8xeXG2I8pX5NoamTGNuomEUFI7fcUjA==",
+                    "version": "4.3.0",
+                    "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+                    "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
                     "requires": {
-                        "@types/color-name": "^1.1.1",
                         "color-convert": "^2.0.1"
                     }
                 },
@@ -3810,9 +1673,9 @@
                     "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
                 },
                 "string-width": {
-                    "version": "4.2.0",
-                    "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
-                    "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
+                    "version": "4.2.2",
+                    "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.2.tgz",
+                    "integrity": "sha512-XBJbT3N4JhVumXE0eoLU9DCjcaF92KLNqTmFCnG1pf8duUxFGwtP6AD6nkjw9a3IdiRtL3E2w3JDiE/xi3vOeA==",
                     "requires": {
                         "emoji-regex": "^8.0.0",
                         "is-fullwidth-code-point": "^3.0.0",
@@ -3838,9 +1701,9 @@
                     }
                 },
                 "y18n": {
-                    "version": "4.0.0",
-                    "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-                    "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w=="
+                    "version": "4.0.3",
+                    "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
+                    "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ=="
                 }
             }
         },
diff --git a/package.json b/package.json
index 58e99198..22e91b40 100644
--- a/package.json
+++ b/package.json
@@ -672,24 +672,23 @@
         "lint": "tslint --project tsconfig.json -e src/*.d.ts -t verbose"
     },
     "devDependencies": {
-        "@types/fs-extra": "5.0.0",
-        "@types/highlight.js": "^9.12.3",
-        "@types/lodash": "^4.14.123",
+        "@types/fs-extra": "^9.0.11",
+        "@types/lodash": "^4.14.170",
         "@types/markdown-it": "0.0.7",
         "@types/mocha": "^2.2.42",
-        "@types/node": "^7.0.43",
+        "@types/node": "^14.14.33",
         "@types/require-from-string": "^1.2.0",
         "@types/vscode": "1.42.0",
-        "tslint": "^5.9.1",
-        "typescript": "^2.6.1"
+        "tslint": "^5.20.1",
+        "typescript": "^4.3.2"
     },
     "dependencies": {
-        "fs-extra": "^6.0.1",
-        "highlight.js": "^9.15.6",
-        "lodash": "^4.17.19",
+        "fs-extra": "^10.0.0",
+        "highlight.js": "^10.7.2",
+        "lodash": "^4.17.21",
         "markdown-it": "^8.4.2",
         "require-from-string": "^2.0.2",
-        "unescape-js": "^1.1.1",
+        "unescape-js": "^1.1.4",
         "vsc-leetcode-cli": "2.8.0"
     }
 }
diff --git a/src/leetCodeManager.ts b/src/leetCodeManager.ts
index 44be87a9..089390d3 100644
--- a/src/leetCodeManager.ts
+++ b/src/leetCodeManager.ts
@@ -83,7 +83,7 @@ class LeetCodeManager extends EventEmitter {
                         env: createEnvOption(),
                     });
 
-                childProc.stdout.on("data", async (data: string | Buffer) => {
+                childProc.stdout?.on("data", async (data: string | Buffer) => {
                     data = data.toString();
                     leetCodeChannel.append(data);
                     if (data.includes("twoFactorCode")) {
@@ -96,19 +96,19 @@ class LeetCodeManager extends EventEmitter {
                             childProc.kill();
                             return resolve(undefined);
                         }
-                        childProc.stdin.write(`${twoFactor}\n`);
+                        childProc.stdin?.write(`${twoFactor}\n`);
                     }
                     const successMatch: RegExpMatchArray | null = data.match(this.successRegex);
                     if (successMatch && successMatch[1]) {
-                        childProc.stdin.end();
+                        childProc.stdin?.end();
                         return resolve(successMatch[1]);
                     } else if (data.match(this.failRegex)) {
-                        childProc.stdin.end();
+                        childProc.stdin?.end();
                         return reject(new Error("Faile to login"));
                     }
                 });
 
-                childProc.stderr.on("data", (data: string | Buffer) => leetCodeChannel.append(data.toString()));
+                childProc.stderr?.on("data", (data: string | Buffer) => leetCodeChannel.append(data.toString()));
 
                 childProc.on("error", reject);
                 const name: string | undefined = await vscode.window.showInputBox({
@@ -120,7 +120,7 @@ class LeetCodeManager extends EventEmitter {
                     childProc.kill();
                     return resolve(undefined);
                 }
-                childProc.stdin.write(`${name}\n`);
+                childProc.stdin?.write(`${name}\n`);
                 const pwd: string | undefined = await vscode.window.showInputBox({
                     prompt: isByCookie ? "Enter cookie" : "Enter password.",
                     password: true,
@@ -131,7 +131,7 @@ class LeetCodeManager extends EventEmitter {
                     childProc.kill();
                     return resolve(undefined);
                 }
-                childProc.stdin.write(`${pwd}\n`);
+                childProc.stdin?.write(`${pwd}\n`);
             });
             if (userName) {
                 vscode.window.showInformationMessage(`Successfully ${inMessage}.`);
diff --git a/src/utils/cpUtils.ts b/src/utils/cpUtils.ts
index 59e907b6..c71ae61c 100644
--- a/src/utils/cpUtils.ts
+++ b/src/utils/cpUtils.ts
@@ -15,13 +15,13 @@ export async function executeCommand(command: string, args: string[], options: c
 
         const childProc: cp.ChildProcess = cp.spawn(command, args, { ...options, env: createEnvOption() });
 
-        childProc.stdout.on("data", (data: string | Buffer) => {
+        childProc.stdout?.on("data", (data: string | Buffer) => {
             data = data.toString();
             result = result.concat(data);
             leetCodeChannel.append(data);
         });
 
-        childProc.stderr.on("data", (data: string | Buffer) => leetCodeChannel.append(data.toString()));
+        childProc.stderr?.on("data", (data: string | Buffer) => leetCodeChannel.append(data.toString()));
 
         childProc.on("error", reject);
 
@@ -42,7 +42,7 @@ export async function executeCommand(command: string, args: string[], options: c
 export async function executeCommandWithProgress(message: string, command: string, args: string[], options: cp.SpawnOptions = { shell: true }): Promise<string> {
     let result: string = "";
     await vscode.window.withProgress({ location: vscode.ProgressLocation.Notification }, async (p: vscode.Progress<{}>) => {
-        return new Promise(async (resolve: () => void, reject: (e: Error) => void): Promise<void> => {
+        return new Promise<void>(async (resolve: () => void, reject: (e: Error) => void): Promise<void> => {
             p.report({ message });
             try {
                 result = await executeCommand(command, args, options);
diff --git a/src/webview/leetCodePreviewProvider.ts b/src/webview/leetCodePreviewProvider.ts
index fba17728..78b40991 100644
--- a/src/webview/leetCodePreviewProvider.ts
+++ b/src/webview/leetCodePreviewProvider.ts
@@ -130,8 +130,6 @@ class LeetCodePreviewProvider extends LeetCodeWebview {
 
     protected onDidDisposeWebview(): void {
         super.onDidDisposeWebview();
-        delete this.node;
-        delete this.description;
         this.sideMode = false;
     }
 
diff --git a/src/webview/leetCodeSolutionProvider.ts b/src/webview/leetCodeSolutionProvider.ts
index d888b3bd..1fad6e22 100644
--- a/src/webview/leetCodeSolutionProvider.ts
+++ b/src/webview/leetCodeSolutionProvider.ts
@@ -64,7 +64,6 @@ class LeetCodeSolutionProvider extends LeetCodeWebview {
 
     protected onDidDisposeWebview(): void {
         super.onDidDisposeWebview();
-        delete this.solution;
     }
 
     private parseSolution(raw: string): Solution {
diff --git a/src/webview/leetCodeSubmissionProvider.ts b/src/webview/leetCodeSubmissionProvider.ts
index f4f18fd4..62d07291 100644
--- a/src/webview/leetCodeSubmissionProvider.ts
+++ b/src/webview/leetCodeSubmissionProvider.ts
@@ -59,7 +59,6 @@ class LeetCodeSubmissionProvider extends LeetCodeWebview {
 
     protected onDidDisposeWebview(): void {
         super.onDidDisposeWebview();
-        delete this.result;
     }
 
     private async showKeybindingsHint(): Promise<void> {