Just as a reference this is the issue I get from the crash reporter.
LoginId:91b4c5d9470a0338f353ffb476d4eece
EpicAccountId:4e61fe71a1fb457880f7d7dcfb02c492
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\RocketSync\4.22.0-5660361+++UE4+Release-4.22\Working\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 611] Array index out of bounds: -1 from an array of size 41
UE4Editor_Core
UE4Editor_Core
UE4Editor_Core
UE4Editor_Core
UE4Editor_Text2LipSync!DispatchCheckVerify<void,<lambda_153d5433ab26277b95d537c6705d781e> >() [d:\rocketsync\4.22.0-5660361+++ue4+release-4.22\working\engine\source\runtime\core\public\misc\assertionmacros.h:162]
UE4Editor_Text2LipSync!UTextLipSync::StretchPhraseData() [d:\build++portal+dev-marketplace+full\sync\localbuilds\plugintemp\hostproject\plugins ext2lipsync\source ext2lipsync\private extlipsynccomponent.cpp:1657]
UE4Editor_Text2LipSync!UTextLipSync::OnSpeaker_AudioSingleEnvelopeValue() [d:\build++portal+dev-marketplace+full\sync\localbuilds\plugintemp\hostproject\plugins ext2lipsync\source ext2lipsync\private extlipsynccomponent.cpp:1488]
UE4Editor_Text2LipSync!UTextLipSync::execOnSpeaker_AudioSingleEnvelopeValue() [d:\build++portal+dev-marketplace+full\sync\localbuilds\plugintemp\hostproject\plugins ext2lipsync\source ext2lipsync\public extlipsynccomponent.h:258]
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll