A friend's Minecraft server has been crashing due to a ticking entity and this line of code is possibly to blame.

Not sure what else may be the reason.
Here is the full crash report if you need it.
https://gist.github.com/thakyZ/5c794771b9b69409b80fb53309cb47d4

I'll close this, if it happens again with a version including the commit above please comment on this issue.