File mozilla-bmo1907511.patch of Package MozillaFirefox.35102

# HG changeset patch
# User stransky <stransky@redhat.com>
# Date 1720807971 0
# Node ID d8a0164db5db7090fd7549b03dd0391f7151649c
# Parent  e243955016ffa880296b8d82cf531887dfb3ac22
Bug 1907511 [Linux/X11] Check mWindow at GtkCompositorWidget::LockSurface() r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D216380

diff --git a/widget/gtk/GtkCompositorWidget.cpp b/widget/gtk/GtkCompositorWidget.cpp
--- a/widget/gtk/GtkCompositorWidget.cpp
+++ b/widget/gtk/GtkCompositorWidget.cpp
@@ -207,13 +207,13 @@ void GtkCompositorWidget::SetRenderingSu
 
 #ifdef MOZ_LOGGING
 bool GtkCompositorWidget::IsPopup() {
   return mWidget ? mWidget->IsPopup() : false;
 }
 #endif
 
 UniquePtr<MozContainerSurfaceLock> GtkCompositorWidget::LockSurface() {
-  return mWidget->LockSurface();
+  return mWidget ? mWidget->LockSurface() : nullptr;
 }
 
 }  // namespace widget
 }  // namespace mozilla