--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -1619,17 +1619,17 @@ ContentParent::RecvAllocateLayerTreeId(c
 mozilla::ipc::IPCResult
 ContentParent::RecvDeallocateLayerTreeId(const ContentParentId& aCpId,
                                          const layers::LayersId& aId)
 {
   GPUProcessManager* gpu = GPUProcessManager::Get();
 
   ContentProcessManager* cpm = ContentProcessManager::GetSingleton();
   RefPtr<ContentParent> contentParent = cpm->GetContentProcessById(aCpId);
-  if (!contentParent->CanCommunicateWith(ChildID())) {
+  if (!contentParent || !contentParent->CanCommunicateWith(ChildID())) {
     return IPC_FAIL(this, "Spoofed DeallocateLayerTreeId call");
   }
 
   if (!gpu->IsLayerTreeIdMapped(aId, contentParent->OtherPid())) {
     // You can't deallocate layer tree ids that you didn't allocate
     KillHard("DeallocateLayerTreeId");
   }