May be a duplicate of this bug, which was closed due to no repro:https://jira.ol.epicgames.net/browse/UE-10978 ...
A crash occurs when using the 'DumpLightMapSizeOnDisk' in the Console Command. ...
When an actor with geometry collection is destroyed, the engine doesn't remove elements from array in the ChaosSolver So illegal references occurs. Removing element with following quick fix code ...
save data does not return the same data and crashes the game ...
This is in response to the reported bug from UDN, here: https://udn.unrealengine.com/questions/313095/in-the-shadowdirectional-light-always-light-skelet.html ...
https://udn.unrealengine.com/questions/315374/reducing-size-of-gpu-particles-textures-breaks-vfx.html#answer-318609 ...
Per https://udn.unrealengine.com/questions/326046/blueprint-properties-reset-across-seamless-travel.html#answer-326562 ...
Discussed here: https://udn.unrealengine.com/questions/385366/hot-reload-cant-find-game-module-dll-that-doesnt-a.html ...
UDN Link: https://udn.unrealengine.com/s/case/5004z00001ndG9mAAE/tarray-uproperty-element-do-not-get-the-correct-default-value ...
Can be worked around with always keeping a viewport opened. https://udn.unrealengine.com/s/question/0D5QP000002Hfdh0AC [Link Removed] ...