Pastbin Crash Server Error

I imagine this is a conflict with other mods, most likely Alex's mobs since it's mentioned as well, but may also have to do with summoned wolves conflicting with Doggy Talents (which shouldn't, since the Doggy Talents' dog is a different entity spawned when the treat is used on a wolf.)

Summary:
Running a small private forge server, only 2 players. One got a Drygmy familiar and summoned wolves, and went out to hunt.

Apparently the crash occurred on something taking damage, and we're not sure what. What we do know is that on attempts to restart the server, I can log in and play normally in the main house where all the other mod stuff exists, so none of it is causing a crash.

However, as soon as the player with the Drygmy logs in, she sees 2 as the environment loads, and the server crashes immediately before any play input can register.

We'll be searching ourselves to try to find the location of the familiar entity data in some way, hoping we can just remove the entity for the time being.

Checked the login location, used a calculator to find the entity region file, found the 2 drygmy familiars, and deleted their entries. She was able to login without issue, so for the time being we'll be avoiding the Drygmy summons. Let us know if any additional information would help pinpoint the issue.