diff --git a/notifier/migration.rb b/notifier/migration.rb
index f3bdaed3ede951303ca4e6c7d0fe6a5388f7a796..dcd8642fc68882a7bb525fd06a941a969eabfa45 100644
--- a/notifier/migration.rb
+++ b/notifier/migration.rb
@@ -198,7 +198,8 @@ class Migration
   end
 
   def init_queries(stats)
-    @queries = stats['query_statistics'].map do |query|
+    query_statistics = stats['query_statistics'] || []
+    @queries = query_statistics.map do |query|
       Query.new(query, execution_context: self)
     end
   end
diff --git a/notifier/spec/migration_spec.rb b/notifier/spec/migration_spec.rb
index 70bdde9a518b45cf1000d790c734a971e8841f58..e452d2e4850b8f7c35e29f9b651d99feea4b3369 100644
--- a/notifier/spec/migration_spec.rb
+++ b/notifier/spec/migration_spec.rb
@@ -93,6 +93,14 @@ RSpec.describe Migration do
     expect(subject.queries.first).to be_a(Query)
   end
 
+  context 'when no query statistics' do
+    let(:queries) { nil }
+
+    it 'does not throw error' do
+      expect { subject.queries }.not_to raise_error
+    end
+  end
+
   describe 'types predicates' do
     context 'with "regular" type' do
       it { is_expected.to be_regular }