4.1.0 log

[10:38:22] [Server thread/INFO]: [MythicMobs] Removed mob from spawner
[10:38:22] [Server thread/WARN]: Unknown target reason, please report on the issue tracker
java.lang.Exception
at net.minecraft.server.v1_11_R1.EntityInsentient.setGoalTarget(EntityInsentient.java:136) [spigot-1.11.2.jar:git-Spigot-625bc00-41a7d14]
at net.minecraft.server.v1_11_R1.EntityInsentient.setGoalTarget(EntityInsentient.java:126) [spigot-1.11.2.jar:git-Spigot-625bc00-41a7d14]
at...

4.1.0 log