It could typically happen when Video element does not have image or video image does not provide - https://searchfox.org/mozilla-central/rev/8698fade12984b9a6a43a85a287a5f17e8fd4ddf/layout/base/nsLayoutUtils.cpp#7056 - https://searchfox.org/mozilla-central/rev/8698fade12984b9a6a43a85a287a5f17e8fd4ddf/layout/base/nsLayoutUtils.cpp#7062
Bug 1629381 Comment 9 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
It could typically happen when Video element does not have image or video image does not provide SourceSurface. - https://searchfox.org/mozilla-central/rev/8698fade12984b9a6a43a85a287a5f17e8fd4ddf/layout/base/nsLayoutUtils.cpp#7056 - https://searchfox.org/mozilla-central/rev/8698fade12984b9a6a43a85a287a5f17e8fd4ddf/layout/base/nsLayoutUtils.cpp#7062