Failed to load format Error: Could not find events for key: undefined

Hello,
I was analyzing a big torch profiling trace with speedscope. The webgl javascript throws an error called "Failed to load format Error: Could not find events for key: undefined". This matches [this line](https://github.com/jlfwong/speedscope/blob/d69f3d0eec29d1d1aeb725b97de3a5209f85447a/src/import/trace-event.ts#L653) in the code.
Thing is, even if events for this key could not be found, I would hope that the profiler could continue process the remaining information, so that I could see at least some flames out of there. Otherwise it is very disappointing to see "Something went wrong" after speedscope parsed the file for about a minute.

Attached is my console's screenshot.