Process crashed with exit code -805306369

I was connected to my own server. (hosted on the same computer as I played on, but it was a separate server)

I pasted something into a command block, and ammidiatly after, I got "Process crashed with exit code -805306369"

This is something I have never got before...?

 

(side note: the server was overloaded and ran 44 ticks behind)