These crash issues are caused by the ability to set the sell(/buy?) price to 0 of any randomly chosen item. If you use the "put quantity in as owner" or the "sell amount" button for that item and enter any number that's higher than 0, it will crash you.
```
[2015-06-05 13:51:34] java.lang.ArithmeticException: / by zero
[2015-06-05 13:51:34] at obfuscated.Ky.a(SourceFile:140)
[2015-06-05 13:51:34] at obfuscated.eA.a(SourceFile:62)
[2015-06-05 13:51:34] at obfuscated.ajC.a(SourceFile:329)
[2015-06-05 13:51:34] at obfuscated.bD.callback(SourceFile:67)
[2015-06-05 13:51:34] at org.schema.schine.network.client.GUICallbackController.execute(SourceFile:42)
[2015-06-05 13:51:34] at obfuscated.C.updateStateInput(SourceFile:2992)
[2015-06-05 13:51:34] at obfuscated.aoa.a(SourceFile:1183)
[2015-06-05 13:51:34] at obfuscated.C.h(SourceFile:2307)
[2015-06-05 13:51:34] at obfuscated.JA.run(SourceFile:86)
[2015-06-05 13:51:34] at java.lang.Thread.run(Unknown Source)
```
It's possible that the item auto sets itself to "0 of activation modules" but I can't reproduce that.