| Index: src/objects-debug.cc | 
| diff --git a/src/objects-debug.cc b/src/objects-debug.cc | 
| index 4f37c2b20dc146651f7169ad9007e8cb90bfb3a6..b21dc4e0478799216bf70d79915cd03c6d0f0d86 100644 | 
| --- a/src/objects-debug.cc | 
| +++ b/src/objects-debug.cc | 
| @@ -977,6 +977,7 @@ void Module::ModuleVerify() { | 
|  | 
| void PrototypeInfo::PrototypeInfoVerify() { | 
| CHECK(IsPrototypeInfo()); | 
| +  CHECK(weak_cell()->IsWeakCell() || weak_cell()->IsUndefined(GetIsolate())); | 
| if (prototype_users()->IsWeakFixedArray()) { | 
| WeakFixedArray::cast(prototype_users())->FixedArrayVerify(); | 
| } else { | 
|  |