When I switch levels in the editor the level tries to load but a few seconds later crashes

Development Getting Started & Setup
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1

This is the crash report. Crashes every time I try to load new level. Installed market content and it started happening. tried uninstalling multiple items but still crash.

Assertion failed: OwningMap.IsNull() || OwningMap.ToSoftObjectPath().ResolveObject() != nullptr [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Engine/Private/HLODProxy.cpp] [Line: 75]

UE4Editor_Core
UE4Editor_Core
UE4Editor_Engine
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_AssetTools
UE4Editor_ContentBrowserAssetDataSource
UE4Editor_ContentBrowserAssetDataSource
UE4Editor_ContentBrowserAssetDataSource
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
user32
user32
UE4Editor_ApplicationCore
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll

2

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