How can I solve this?

When I spawn mobs, its design works normally.

But error messages appear in console.

How can I solve this?

I use Lib's Disguises 9.1.2 and Mythicmobs 4.3.2 in 1.11.2 Spigot

[13:40:49 WARN]: [MythicMobs] Task #1069 for MythicMobs v4.3.2-SNAPSHOT generated an exception
java.lang.NullPointerException
at me.libraryaddict.disguise.disguisetypes.Disguise.setWatcher(Disguise.java:701) ~[?:?]
at...

How can I solve this?