Check types in '_addFix_createConstructorSuperExplicit'.

pkg/analysis_server/lib/src/services/correction/fix_internal.dart

Index: pkg/analysis_server/lib/src/services/correction/fix_internal.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
index 5dc5c2df0601534fdccdf9239b89356d1e03ebd7..e00e4fd62811be4a2ea73804b3a810edff097f11 100644
--- a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
+++ b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
@@ -752,6 +752,10 @@ class FixProcessor {
   }
 
   void _addFix_createConstructorSuperExplicit() {
+    if (node.parent is! ConstructorDeclaration ||
+        node.parent.parent is! ClassDeclaration) {
+      return;
+    }
     ConstructorDeclaration targetConstructor =
         node.parent as ConstructorDeclaration;
     ClassDeclaration targetClassNode =