UE4 Engine crash when compile inherented Animation Blueprints

I encounter a wired problem about compile Animation BP:

I have one character: a skeleton and a animation bp for this.
and then I have another character, an other skeleton and another animation bp that inheretant from the first one.

When I open any single bp, and try to compile it. all good. however when I open two animation bp and try to complie the first one. the editor crashed.

error.txt (6.6 KB)

After servel times attempts, I found when i disable another animation bp’s preview, engine will not crash.

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