1 files changed, 5 insertions, 1 deletions
diff --git a/dom/media/mediacontrol/MediaControlKeySource.cpp b/dom/media/mediacontrol/MediaControlKeySource.cpp
index 22756c860a..db372fc57b 100644
--- a/dom/media/mediacontrol/MediaControlKeySource.cpp
+++ b/dom/media/mediacontrol/MediaControlKeySource.cpp
@@ -36,7 +36,11 @@ void MediaControlKeyHandler::OnActionPerformed(
     return;
   }
 
-  switch (aAction.mKey) {
+  if (aAction.mKey.isNothing()) {
+    MOZ_ASSERT_UNREACHABLE("Error : undefined media key!");
+    return;
+  }
+  switch (aAction.mKey.value()) {
     case MediaControlKey::Focus:
       controller->Focus();
       return;