org.luaj.vm2.LuaError: LuaTimeOutSandbox.loader:35 org.luaj.vm2.LuaError: #137:6 bad argument: string expected, got nil
stack traceback:
	#137:6: in function 'split'
	#351:143: in main chunk
	[Java]: in ?
	at org.luaj.vm2.LuaValue.argerror(LuaValue.java:1072)
	at org.luaj.vm2.LuaValue.checkstring(LuaValue.java:997)
	at org.luaj.vm2.Varargs.checkstring(Varargs.java:343)
	at org.luaj.vm2.lib.StringLib.gmatch(StringLib.java:515)
	at org.luaj.vm2.lib.StringLib$StringLibV.invoke(StringLib.java:105)
	at org.luaj.vm2.LuaClosure.execute(LuaClosure.java:385)
	at org.luaj.vm2.LuaClosure.onInvoke(LuaClosure.java:190)
	at org.luaj.vm2.LuaClosure.invoke(LuaClosure.java:183)
	at org.luaj.vm2.LuaClosure.execute(LuaClosure.java:385)
	at org.luaj.vm2.LuaClosure.onInvoke(LuaClosure.java:190)
	at org.luaj.vm2.LuaClosure.invoke(LuaClosure.java:183)
	at org.luaj.vm2.LuaThread$State.run(LuaThread.java:192)
	at java.lang.Thread.run(Thread.java:745)

stack traceback:
	LuaTimeOutSandbox.loader:35: in main chunk
	[Java]: in ?
	at org.luaj.vm2.lib.BaseLib$error.call(BaseLib.java:179)
	at org.luaj.vm2.lib.TwoArgFunction.invoke(TwoArgFunction.java:73)
	at org.luaj.vm2.LuaClosure.execute(LuaClosure.java:385)
	at org.luaj.vm2.LuaClosure.onInvoke(LuaClosure.java:190)
	at org.luaj.vm2.LuaClosure.invoke(LuaClosure.java:183)
	at org.luaj.vm2.LuaValue.invoke(LuaValue.java:1743)
	at net.luaos.tb.common.Loader.invoke(Loader.java:65)
	at net.luaos.tb.common.LuaTimeOutSandbox.callLuaWithStats(LuaTimeOutSandbox.java:76)
	at net.luaos.tb.tb12.Sandbox.callFunctionWithStats(Sandbox.java:166)
	at net.luaos.tb.tb12.Sandbox.callLuaWithStats(Sandbox.java:156)
	at net.luaos.tb.tb12.Sandbox.runLuaWithStats(Sandbox.java:140)
	at net.luaos.tb.tb32.IRLuaScriptRunner.run_returnWithStats(IRLuaScriptRunner.java:33)
	at net.luaos.tb.tb32.IRPitcher.runScript(IRPitcher.java:151)
	at net.luaos.tb.tb32.IRPitcher.pitchPair(IRPitcher.java:135)
	at net.luaos.tb.tb32.IRPitcher.recalcs(IRPitcher.java:252)
	at net.luaos.tb.tb32.IRPitcher.main(IRPitcher.java:40)
	at irpitcher.main(irpitcher.java:8)