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DrawDebugSphere and DrawDebugAltCone both try to dereference variable 'LineBatcher' without checking for null, as the other DrawDebug functions do.
Use either DrawDebugSphere or DrawDebugAltCone in a CTOR and it will crash while attempting to dereference LineBatcher.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-30213 in the post.