Don't search for 'declaration' of elements, just name is usually enough.

pkg/analysis_server/lib/src/services/refactoring/convert_getter_to_method.dart

Index: pkg/analysis_server/lib/src/services/refactoring/convert_getter_to_method.dart
diff --git a/pkg/analysis_server/lib/src/services/refactoring/convert_getter_to_method.dart b/pkg/analysis_server/lib/src/services/refactoring/convert_getter_to_method.dart
index 5dd94166383e472e0a3c327aa5c3185b5f2e1b0c..0dac920f65c6f24ded500f9e392729e872890a83 100644
--- a/pkg/analysis_server/lib/src/services/refactoring/convert_getter_to_method.dart
+++ b/pkg/analysis_server/lib/src/services/refactoring/convert_getter_to_method.dart
@@ -91,11 +91,14 @@ class ConvertGetterToMethodRefactoringImpl extends RefactoringImpl
     // prepare "get" keyword
     Token getKeyword = null;
     {
-      AstNode node = await astProvider.getParsedNodeForElement(element);
-      if (node is MethodDeclaration) {
-        getKeyword = node.propertyKeyword;
-      } else if (node is FunctionDeclaration) {
-        getKeyword = node.propertyKeyword;
+      AstNode name = await astProvider.getParsedNameForElement(element);
+      AstNode declaration = name?.parent;
+      if (declaration is MethodDeclaration) {
+        getKeyword = declaration.propertyKeyword;
+      } else if (declaration is FunctionDeclaration) {
+        getKeyword = declaration.propertyKeyword;
+      } else {
+        return;
       }
     }
     // remove "get "