Safeguard for webMediaPlayer() access

Source/modules/imagebitmap/ImageBitmapFactories.cpp

Index: Source/modules/imagebitmap/ImageBitmapFactories.cpp
diff --git a/Source/modules/imagebitmap/ImageBitmapFactories.cpp b/Source/modules/imagebitmap/ImageBitmapFactories.cpp
index 38be61725f830648ec68dc7202287b4fd8b0fae4..c7ebf2dffab69ab52542a92b2dc9382861ba971d 100644
--- a/Source/modules/imagebitmap/ImageBitmapFactories.cpp
+++ b/Source/modules/imagebitmap/ImageBitmapFactories.cpp
@@ -124,6 +124,10 @@ ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState,
     // This variant does not work in worker threads.
     ASSERT(eventTarget.toDOMWindow());
 
+    if (!video->webMediaPlayer()) {
+        exceptionState.throwDOMException(InvalidStateError, "No player can be retrieved from the provided video element.");
+        return ScriptPromise();
+    }
     if (video->networkState() == HTMLMediaElement::NETWORK_EMPTY) {
         exceptionState.throwDOMException(InvalidStateError, "The provided element has not retrieved data.");
         return ScriptPromise();