Observed by 4.7 preview 5 user. After closed investigation it turned out he had two consequent AIController::UseBlackboard calls, which triggered a ensure failure in AISystem::UnregisterBlackboardComponent. After a brief investigation I've found that AISystem::RegisterBlackboardComponent is not being called in all cases it should.

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ComponentUE - AI
Affects Versions4.7
Target Fix4.7
Fix Commit2435270
Release Commit2438102
CreatedFeb 6, 2015
ResolvedFeb 6, 2015
UpdatedApr 27, 2018
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