diff --git a/dom/media/MediaData.cpp b/dom/media/MediaData.cpp
index 17e47434630d..0a70561ef6f3 100644
--- a/dom/media/MediaData.cpp
+++ b/dom/media/MediaData.cpp
@@ -186,8 +186,7 @@ static bool ValidateBufferAndPicture(const VideoData::YCbCrBuffer& aBuffer,
 
   // The following situations could be triggered by invalid input
   if (aPicture.width <= 0 || aPicture.height <= 0) {
-    // In debug mode, makes the error more noticeable
-    MOZ_ASSERT(false, "Empty picture rect");
+    NS_WARNING("Empty picture rect");
     return false;
   }
   if (!ValidatePlane(aBuffer.mPlanes[0]) ||