Vulcan | Advanced Cheat Detection

I've tried Vulcan on other sites and I always get this error:

[19:15:39 WARN]: java.lang.NullPointerException
[19:15:39 WARN]: at me.frep.vulcan.spigot.check.AbstractCheck.Vulcan_d(AbstractCheck.java:67)
[19:15:39 WARN]: at me.frep.vulcan.spigot.check.impl.combat.aim.AimL.Vulcan_a(AimL.java:45)
[19:15:39 WARN]: at me.frep.vulcan.spigot.Vulcan_t.lambda$handle$0(Vulcan_t.java:76)
[19:15:39 WARN]: at java.util.ArrayList.forEach(ArrayList.java:1257)
[19:15:39 WARN]: at me.frep.vulcan.spigot.Vulcan_t.Vulcan_a(Vulcan_t.java:76)
[19:15:39 WARN]: at me.frep.vulcan.spigot.Vulcan_bN.lambda$onPacketPlayReceive$0(Vulcan_bN.java:39)
[19:15:39 WARN]: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[19:15:39 WARN]: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[19:15:39 WARN]: at java.lang.Thread.run(Thread.java:748)