--- a/js/src/frontend/Parser.cpp
+++ b/js/src/frontend/Parser.cpp
@@ -6994,16 +6994,19 @@ bool GeneralParser<ParseHandler, Unit>::
     ClassMethodType method = handler_.newClassMethodDefinition(
         constructorNameNode, synthesizedCtor, AccessorType::None,
         /* isStatic = */ false);
     if (!method) {
       return false;
     }
     LexicalScopeNodeType scope =
         finishLexicalScope(dotInitializersScope, method);
+    if (!scope) {
+      return false;
+    }
     if (!handler_.addClassMemberDefinition(classMembers, scope)) {
       return false;
     }
   }
 
   if (FunctionBox* ctorbox = classStmt.constructorBox) {
     // Amend the toStringEnd offset for the constructor now that we've
     // finished parsing the class.