Bug UnsupportedOperationException

I'm trying to write a bot, and every time I restart RuneMate then run it, it crashes with this error:

Code (Text):

1. java.lang.UnsupportedOperationException: Only a Thread within a bot's ThreadGroup may eavesdrop on the game client. Current Thread=Thread[pool-4-thread-1,5,[t-g]9240 - Infinite Cannoneer]
2.     at nul.iIiIIIiiiiIi.for(pqb:138)
3.     at com.runemate.game.api.hybrid.Environment.getGameType(emb:160)
4.     at com.runemate.game.api.hybrid.Environment.isRS3(emb:194)
5.     at nul.iiIIIIiIiiii.for(nab:75)
6.     at nul.iiIIIIiIiiii.validate(nab:143)
7.     at com.runemate.game.api.script.framework.LoopingBot.run(wxa:96)
8.     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
9.     at java.util.concurrent.FutureTask.run(FutureTask.java:266)
10.     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
11.     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
12.     at java.lang.Thread.run(Thread.java:745)

If I run it again afterwards, it works fine. Anyone know what's causing this?
RuneMate Version: Latest, in development mode using IDEA.
Affected Games: OSRS (Haven't tried RS3).