Unreal Engine Issues and Bug Tracker (UE-45109)

Description

Crash when setting a named slot widget's name to be the same as another named slot widget

Steps to Reproduce

Open the editor
Create a a new widget blueprint
Name it "ParentWidget"
Inside ParentWidget, add a named slot to the designer tab
Name it "Content Slot"
Create another widget blueprint
Name it "ChildWidget"
Inside ChildWidget, add an instance of ParentWidget (via the user created section)
Inside the Content Slot of ParentWidget, add a new Named Slot
Rename the new named slot to "Content Slot" (the same as its containing slot)
Notice that the editor crashes

Expected: The user would be given an error preventing the name from being used
Result: The editor crashes

Callstack

UE4Editor_UMG!UNamedSlot::OnSlotRemoved() namedslot.cpp:92 
UE4Editor_UMG!UPanelWidget::ClearChildren() panelwidget.cpp:225 
UE4Editor_UMG!<lambda_fb1594f3c50b59a8f4d88d0decec41b2>::operator() userwidget.cpp:107 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:107 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101 
UE4Editor_UMG!UWidgetTree::ForWidgetAndChildren<<lambda_fb1594f3c50b59a8f4d88d0decec41b2> >() widgettree.h:101

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Cannot Reproduce

Component	UE - Editor - UI Systems
Affects Versions	4.15.2

Created	May 16, 2017
Resolved	Jul 6, 2017
Updated	Jun 23, 2018

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