diff --git a/layout/style/nsMediaFeatures.cpp b/layout/style/nsMediaFeatures.cpp
index fca5cc5ed..01007a0cb 100644
--- a/layout/style/nsMediaFeatures.cpp
+++ b/layout/style/nsMediaFeatures.cpp
@@ -351,6 +351,10 @@ GetPointerCapabilities(nsPresContext* aPresContext,
     if (baseWindow) {
       nsCOMPtr<nsIWidget> mainWidget;
       baseWindow->GetMainWidget(getter_AddRefs(mainWidget));
+      if (!mainWidget) {
+        // We don't have a usable widget to query; bail. See Issue #2981
+        return;
+      }
       mainWidget->GetPointerCapabilities(aCaps);
     }
   }