Forcefully destroy sessions before connecting or creating new

Source/TurnBasedTutorial/BattleMode/GameOverWidget.cpp

@@ -11,7 +11,7 @@ void UGameOverWidget::NativeConstruct() {
     ButtonToMenu->OnClicked.AddDynamic(this, &ThisClass::QuitCurrentSession);
 }
 
-void UGameOverWidget::QuitCurrentSession_Implementation() {
+void UGameOverWidget::QuitCurrentSession() {
     const UGameInstance *GameInstance = UGameplayStatics::GetGameInstance(
         GetWorld());
     USessionsGameInstanceSubsystem *GameInstanceSubsystem = GameInstance->GetSubsystem

Source/TurnBasedTutorial/BattleMode/GameOverWidget.h

@@ -19,7 +19,7 @@ public:
     UFUNCTION(Client, Reliable)
     void SetWidgetText(bool HasWon);
 
-    UFUNCTION(Client, Reliable)
+    UFUNCTION()
     void QuitCurrentSession();
 
 protected:

Source/TurnBasedTutorial/MainMenu/MainMenuWidget.cpp

@@ -16,11 +16,17 @@ void UMainMenuWidget::NativeConstruct() {
 }
 
 void UMainMenuWidget::OnHostOnlineGameButtonClicked() {
+    // Ensure we have left any session
+    GetMyGameSubsystem()->DestroySession();
+    
     GetMyGameSubsystem()->CreateSession(
         "Lobby " + FString::FromInt(FMath::RandRange(1, 1e6)), 2, true);
 }
 
 void UMainMenuWidget::StartSessionWhenCreatingSessonComplete(bool bSuccess) {
+    if (!bSuccess) {
+        return;
+    }
     GetMyGameSubsystem()->StartSession();
 }
 

Source/TurnBasedTutorial/MainMenu/SessionListWidget.cpp

@@ -22,6 +22,9 @@ void USessionListWidget::NativeConstruct() {
     MyGameInstanceSubsystem->OnJoinSessionCompleteEvent.AddUObject(
         this, &ThisClass::OnJoinSessionSuccess);
 
+    // Ensure we have left any session
+    GetMyGameSubsystem()->DestroySession();
+    
     // Initiate search
     MyGameInstanceSubsystem->FindSessions(10, true);
 }