I'd say ignore this issue unless it happens again. Unless you find a definite way to reproduce an error, it might be caused by things out of your control.
If it happens again, post again with the following informations:
1) what did you do when it crashed?
2) how did the game crash (Error message, simply returning to desktop, game freeze, server split)?
The second question is extremely important, as it gives your crash details that help to find the culprit.
Crashes with error messages are often caused by incorrect input data of functions.
Crashes back to desktop without any error messages are usually caused by infinite loops.
Game freezes are pretty rare and usually caused by semi-infinite loops or high memory usage.
Server splits are caused by various issues.