Crash when touch nodes

incredible crash in UE 5 EA.
I use modify bone(transform) to simulate recoil;but when I drag (or any other operations) the modify node,
Crash will happen. Does anyone meet similar problem or have solution?
I guess some references is wrong because I notice a 0x0000, nullptr tip in crash reporter.,but how can editor crash
without compile and run?
I find that if I break the links firstly, operate secondly, then link again and compile ,It wont crash…
but still bothered:~(
well, strange warning"nodes contains no lod "appears too.