This is a semi-common crash in the 4.18 release. There is one recorded case of this callstack also occurring back in the 4.11 release, but it seems to be an exception. All other cases have only occurred in the 4.18 release.
User Descriptions
Source Context
2292 ALandscapeProxy* Proxy = Component->GetLandscapeProxy(); 2293 Component->Modify(); 2294 Proxy->Modify(); 2295 2296 // Mark the channel as unallocated, so we can reuse it later 2297 const int32 DeleteLayerWeightmapTextureIndex = Component->WeightmapLayerAllocations[LayerIdx].WeightmapTextureIndex; 2298 FLandscapeWeightmapUsage& Usage = Proxy->WeightmapUsageMap.FindChecked(Component->WeightmapTextures[DeleteLayerWeightmapTextureIndex]); 2299 ***** Usage.ChannelUsage[Component->WeightmapLayerAllocations[LayerIdx].WeightmapTextureChannel] = NULL; 2300 2301 // Remove the layer as it's totally painted away. 2302 Component->WeightmapLayerAllocations.RemoveAt(LayerIdx);
repro steps currently unknown
Assertion failed: Pair != nullptr [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\Core\Public\Containers/Map.h] [Line: 478] UE4Editor_Landscape!DeleteLayerIfAllZero() [landscapeeditinterface.cpp:2300] UE4Editor_Landscape!FLandscapeEditDataInterface::SetAlphaData() [landscapeeditinterface.cpp:2916] UE4Editor_LandscapeEditor!FAlphamapAccessor<1,0>::SetData() [landscapeedmodetools.h:968] UE4Editor_LandscapeEditor!FLandscapeToolStrokePaint::Apply() [landscapeedmodepainttools.cpp:253] UE4Editor_LandscapeEditor!FLandscapeToolBase<FLandscapeToolStrokePaint>::Tick() [landscapeedmodetools.h:1353] UE4Editor_LandscapeEditor!FEdModeLandscape::Tick() [landscapeedmode.cpp:737] UE4Editor_UnrealEd!FEditorModeTools::Tick() [editormodemanager.cpp:716] UE4Editor_UnrealEd!FLevelEditorViewportClient::Tick() [leveleditorviewport.cpp:2072] UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:1734] UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:396] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3296] UE4Editor!GuardedMain() [launch.cpp:166] UE4Editor!GuardedMainWrapper() [launchwindows.cpp:134] UE4Editor!WinMain() [launchwindows.cpp:210] UE4Editor!__scrt_common_main_seh() [exe_common.inl:253] kernel32!BaseThreadInitThunk() ntdll!RtlUserThreadStart()
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-52765 in the post.
| 2 |
| Component | UE - LD & Modeling - Terrain - Landscape |
|---|---|
| Affects Versions | 4.18, 4.18.1, 4.19 |
| Target Fix | 4.21 |
| Created | Nov 28, 2017 |
|---|---|
| Resolved | Oct 22, 2018 |
| Updated | Dec 11, 2018 |