Console error, Crazy throw

[20:37:50] [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:137) ~[patched_1.11.2.jar:git-Paper-1100]
    at net.minecraft.server.v1_11_R1.EntityInsentient.setGoalTarget(EntityInsentient.java:127) ~[patched_1.11.2.jar:git-Paper-1100]
    at...