--- a/widget/nsBaseWidget.cpp
+++ b/widget/nsBaseWidget.cpp
@@ -1281,16 +1281,17 @@ void nsBaseWidget::CreateCompositor(int 
     shadowManager = mCompositorBridgeChild->SendPLayerTransactionConstructor(
       backendHints, 0, &textureFactoryIdentifier, &success);
   }
 
   ShadowLayerForwarder* lf = lm->AsShadowForwarder();
 
   if (!success || !lf) {
     NS_WARNING("Failed to create an OMT compositor.");
+    mAPZC = nullptr;
     DestroyCompositor();
     mLayerManager = nullptr;
     mCompositorBridgeChild = nullptr;
     mCompositorBridgeParent = nullptr;
     mCompositorVsyncDispatcher = nullptr;
     return;
   }