Production message "stream error WebSocket frame length too large"

I have a fine running production app but when lately checking the logs I read lots of entries of the following:

[xxx.xxx.xxx.xxx]: stream error WebSocket frame length too large

but I can’t find any stack trace, nor is it causing any crashing or undesired behavior, ultimately I could not find this message in the codebase of the Meteor framework repo.

Anybody experienced this before?