HTMLMediaElement::webMediaPlayer() should never be null if m_readyState >= HAVE_METADATA (multiple …

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index 385f7ee088b0d2f72e17a66f06fe6ff430d477e0..04a33cbcb3dfcf348fb3894d54ee0b6efa296e2d 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -2721,6 +2721,9 @@ void HTMLMediaElement::sourceWasAdded(HTMLSourceElement* source)
     if (m_nextChildNodeToConsider)
         return;
 
+    if (m_loadState != WaitingForSource)
+        return;
+
     // 4.8.9.5, resource selection algorithm, source elements section:
     // 21. Wait until the node after pointer is a node other than the end of the list. (This step might wait forever.)
     // 22. Asynchronously await a stable state...