--- a/widget/cocoa/RectTextureImage.mm
+++ b/widget/cocoa/RectTextureImage.mm
@@ -44,16 +44,20 @@ RectTextureImage::BeginUpdate(const Layo
   if (mUpdateRegion.IsEmpty()) {
     return nullptr;
   }
 
   if (!mIOSurface || needRecreate) {
     DeleteTexture();
     mIOSurface = MacIOSurface::CreateIOSurface(mBufferSize.width,
                                                mBufferSize.height);
+
+    if (!mIOSurface) {
+      return nullptr;
+    }
   }
 
   mInUpdate = true;
 
   mIOSurface->Lock(false);
   unsigned char* ioData = (unsigned char*)mIOSurface->GetBaseAddress();
   gfx::IntSize size(mBufferSize.width, mBufferSize.height);
   int32_t stride = mIOSurface->GetBytesPerRow();