diff --git a/gfx/2d/Factory.cpp b/gfx/2d/Factory.cpp
index 8179b5ffee42..e4b23527acc9 100644
--- a/gfx/2d/Factory.cpp
+++ b/gfx/2d/Factory.cpp
@@ -933,7 +933,7 @@ RefPtr<IDWriteFontCollection> Factory::GetDWriteSystemFonts(bool aUpdate) {
   RefPtr<IDWriteFontCollection> systemFonts;
   HRESULT hr =
       mDWriteFactory->GetSystemFontCollection(getter_AddRefs(systemFonts));
-  if (FAILED(hr)) {
+  if (FAILED(hr) || !systemFonts) {
     // only crash some of the time so those experiencing this problem
     // don't stop using Firefox
     if ((rand() & 0x3f) == 0) {