MythicMobs 4.2.0 [Error log]

[06:29:13] [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-3fb9445-6e3cec8]
at net.minecraft.server.v1_11_R1.EntityInsentient.setGoalTarget(EntityInsentient.java:126) ~[spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8]
at...

MythicMobs 4.2.0 [Error log]