Description

Log showing the issue is caused by a reimport:
https://udn.unrealengine.com/questions/331317/recurring-editor-crash.html

This Jira was created from CrashReports submitted by the public due to the high number of occurrences.

Error message:

Assertion failed: Reference != 0 [Link Removed] [Line: 73]

Source Context:

  59       Reset(InReference);
   60       return *this;
   61       }
   62       
   63       // Dereferencing operators.
   64       ReferencedType& operator*() const
   65       {
   66       check(Reference != 0);
   67       return *Reference;
   68       }
   69       
   70       ReferencedType* operator->() const
   71       {
   72       check(Reference != 0);
   73 ***** return Reference;
   74       }
   75       
   76       ReferencedType* GetOwnedPointer() const
   77       {
   78       return Reference;
   79       }
   80       
   81       /** Returns true if the pointer is valid */
   82       bool IsValid() const
   83       {
   84       return ( Reference != 0 );
   85       }
   86       
   87       // implicit conversion to the reference type.
   88       operator ReferencedType*() const

Most recent user affected CL: 2992821

Logs:
[Link Removed]
[Link Removed]
[Link Removed]

Steps to Reproduce

Repro steps unknown

Callstack
UE4Editor_Engine!TScopedPointer<FStaticMeshRenderData>::operator->() [scopedpointer.h:74]
UE4Editor_Engine!FDistanceFieldAsyncQueue::Build() [distancefieldatlas.cpp:489]
UE4Editor_Engine!FBuildDistanceFieldThreadRunnable::Run() [distancefieldatlas.cpp:382]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:74]

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Cannot Reproduce
ComponentRendering
Affects Versions4.84.94.104.114.12
Target Fix4.15
CreatedJun 6, 2016
ResolvedJan 25, 2017
UpdatedApr 27, 2018