Script Error

When i start a script and waits for 30min-2hours i get this error.

java.lang.NullPointerException
at com.speljohan.rsbot.script.Calculations.worldToMinimap(Calculations.java:107)
at com.speljohan.rsbot.script.Methods.worldToMinimap(Methods.java:2237)
at com.speljohan.rsbot.script.Methods.tileToMinimap(Methods.java:695)
at com.speljohan.rsbot.script.Methods.walkTileMM(Methods.java:403)
at TenacWillowChopper.myWalkTile(TenacWillowChopper.java:651)
at TenacWillowChopper.chopWillow(TenacWillowChopper.java:360)
at TenacWillowChopper.loop(TenacWillowChopper.java:224)
at com.speljohan.rsbot.script.Script.run(Script.java:102)
at com.speljohan.rsbot.script.ScriptHandler$1.run(ScriptHandler.java:70)
at java.lang.Thread.run(Thread.java:619)

I get almost the same error on every script.
That error are from the script Tenac Willow Chopper.
I use RSBot 1.531. Help ?

 

Yeah I get this error as well after a few hours of botting. It sure is annoying...

 

Is it a way to avoid this?