The game cracshes on JoinSession function

[SaJjad1378]

I used this condition but it returns true and the crash happens again
here is the edited code:

for (auto Result : SearchSettings->SearchResults)
		{
			FString Id = Result.GetSessionIdStr();
			FString User = Result.Session.OwningUserName;

			FString MatchType;
			Result.Session.SessionSettings.Get(FName("MatchType"),MatchType);
			if(MatchType == FString("FreeForAll"))
			{
				if(!Result.IsSessionInfoValid())
					return;
				if (GEngine)
				{
					GEngine->AddOnScreenDebugMessage(
						-1,
						15.f,
						FColor::Cyan,
						FString::Printf(TEXT("Joining Match Type: %s ..."), *MatchType)
					);
				}
				
				OnlineSessionInterface->AddOnJoinSessionCompleteDelegate_Handle(OnSessionJoinedDelegate);

				auto NetId = GetPlayerState()->GetUniqueId();
				OnlineSessionInterface->JoinSession(*NetId, NAME_GameSession, Result); //Game crashes
			}
			
			if(GEngine)
			{
				GEngine->AddOnScreenDebugMessage(
					-1,
					15.f,
					FColor::Blue,
					FString::Printf(TEXT("ID: %s | Owner: %s"),*Id,*User)
					);
			}
		}