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Frequent crash at anim bp compilation

Hi guys,

I am trying to split one big anim blueprint in several blueprints using sub anim instances. Almost every time I do a modification, engine crashes on TArray::void RangeCheck(int32 Index) const method at folowing line:

     checkf((Index >= 0) & (Index < ArrayNum),TEXT("Array index out of bounds: %i from an array of size %i"),Index,ArrayNum); // & for one branch

with following callstack: alt text

Any idea how I could workaround this crash? thanks

Product Version: UE 4.20
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asked Oct 17 '18 at 06:25 PM in Using UE4

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avatar image RudyZ_reflector Oct 17 '18 at 06:27 PM

Quick precision: Crash occurs at blueprint compilation

avatar image RudyZ_reflector Oct 18 '18 at 08:52 PM

The issue seem tightly related to nested anim BP. An anim BP will compile properly, but as soon as the anim BP is used as a Sub Anim Instance, it will crash. It might be related to following crash: https://answers.unrealengine.com/questions/806630/nested-sub-anim-instances-with-exposed-properties.html

as I have as well exposed variable from one blueprint to its sub anim instance.

Another precision that could be of importance: recompiling UE4 in debug seem to make the bug disappear

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