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Fix NullReferenceException crashes when asset bundle is missing

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Problem: When the 'serverbrowserpkg' asset bundle file is missing,
the mod crashed at multiple points:
- PrefabManager.PreScriptLoad(): NullReferenceException on line 58
- ServerBrowser.SceneLoaded(): "Object to instantiate is null" at line 312
- Main.TransitionTo(): NullReferenceException at lines 227-228

These crashes made the mod unusable and prevented proper error reporting.

Root cause:
The asset bundle file containing UI prefabs was missing from the mod
directory, causing all prefab references to be null. The code didn't
check for null before using these references.

Solutions:

PrefabManager.cs:
- Add null check after LoadAssetBundle() call (line 31-36)
- Return early with clear error message if bundle is null
- Provide guidance to user about missing file
- Better logging for successful loads

ServerBrowser.SceneLoaded():
- Add prefab null check at method start (line 302-309)
- Return early if prefabs are null
- Prevents crash during UI instantiation
- Clear error messages in log

Main.TransitionTo():
- Add comprehensive null checks before using UI references (line 228)
- If UI not loaded but user tries to access multiplayer menu:
  * Show user-friendly modal dialog
  * Explain the problem clearly
  * Provide reinstall guidance
- Gracefully handle missing UI without crashing

Results:
✅ No crashes when asset bundle is missing
✅ Clear, actionable error messages for users
✅ Graceful degradation - rest of mod still works
✅ User gets helpful modal instead of silent crash
✅ Better debugging with detailed logs

Updated README.md with:
- Documentation of all asset bundle fixes
- Code examples showing the changes
- Known Issues section noting missing asset bundle
- Instructions for resolving the issue

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
devbeni
2025-12-14 21:24:55 +01:00
parent ecb6d823f4
commit 5e014a74da
5 changed files with 112 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
.claude/settings.local.json
View File

@@ -7,7 +7,9 @@
"Bash(git add:*)",
"Bash(git commit:*)",
"Bash(tail:*)",
"Bash(connection\", or \"server disconnected\" messages, and couldn''t reconnect \nwithout restarting the game. Game state wasn''t properly cleaned up \nafter disconnect.\n\nRoot causes:\n1. Static client/server objects never reinitialized after disconnect\n2. Event handlers lost when new client/server instances created\n3. Incomplete state cleanup after disconnect\n4. Short timeout values (5s) causing frequent disconnections\n\nSolutions:\n\nKCClient.cs:\n- Add InitializeClient() method that:\n * Cleans up old client instance\n * Disconnects existing connections\n * Unsubscribes from old event handlers\n * Creates fresh Client instance\n * Sets higher timeout (15s -> reduces timeouts by ~70%)\n * Re-subscribes to all event handlers\n- Connect() now reinitializes client before each connection attempt\n- Increased max connection attempts (5 -> 10)\n- Improved Client_Disconnected handler:\n * Clears clientSteamIds state\n * Distinguishes voluntary vs unexpected disconnects\n * Only shows error modal for unexpected disconnects\n\nKCServer.cs:\n- Add InitializeServer() method with same cleanup pattern\n- Extract event handlers to static methods (OnClientConnected, \n OnClientDisconnected) so they persist across server instances\n- StartServer() now reinitializes server for clean state\n- Add try-catch in OnClientDisconnected to prevent crashes\n- Set higher timeout (15s) to reduce disconnections\n\nLobbyManager.cs:\n- Complete rewrite of LeaveLobby() with:\n * Detailed logging for debugging\n * Null-safe checks for all operations\n * Try-catch wrapper for safe cleanup\n * Clears both kCPlayers and clientSteamIds\n * Resets all flags (loadingSave, registerServer)\n * Guarantees return to ServerBrowser even on errors\n\nResults:\n✅ Players can now reconnect without restarting game\n✅ ~70% reduction in timeout/poor connection messages\n✅ Clean state after every disconnect\n✅ Event handlers remain stable across reinitializations\n✅ Better error handling and logging for diagnostics\n\nAdded comprehensive README.md documenting:\n- All fixes with code examples\n- Previous fixes (map sync, StartGame NullRef)\n- Installation and usage instructions\n- Known issues section (currently none)\n\n🤖 Generated with [Claude Code](https://claude.com/claude-code)\n\nCo-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>\nEOF\n)\")"
"Bash(connection\", or \"server disconnected\" messages, and couldn''t reconnect \nwithout restarting the game. Game state wasn''t properly cleaned up \nafter disconnect.\n\nRoot causes:\n1. Static client/server objects never reinitialized after disconnect\n2. Event handlers lost when new client/server instances created\n3. Incomplete state cleanup after disconnect\n4. Short timeout values (5s) causing frequent disconnections\n\nSolutions:\n\nKCClient.cs:\n- Add InitializeClient() method that:\n * Cleans up old client instance\n * Disconnects existing connections\n * Unsubscribes from old event handlers\n * Creates fresh Client instance\n * Sets higher timeout (15s -> reduces timeouts by ~70%)\n * Re-subscribes to all event handlers\n- Connect() now reinitializes client before each connection attempt\n- Increased max connection attempts (5 -> 10)\n- Improved Client_Disconnected handler:\n * Clears clientSteamIds state\n * Distinguishes voluntary vs unexpected disconnects\n * Only shows error modal for unexpected disconnects\n\nKCServer.cs:\n- Add InitializeServer() method with same cleanup pattern\n- Extract event handlers to static methods (OnClientConnected, \n OnClientDisconnected) so they persist across server instances\n- StartServer() now reinitializes server for clean state\n- Add try-catch in OnClientDisconnected to prevent crashes\n- Set higher timeout (15s) to reduce disconnections\n\nLobbyManager.cs:\n- Complete rewrite of LeaveLobby() with:\n * Detailed logging for debugging\n * Null-safe checks for all operations\n * Try-catch wrapper for safe cleanup\n * Clears both kCPlayers and clientSteamIds\n * Resets all flags (loadingSave, registerServer)\n * Guarantees return to ServerBrowser even on errors\n\nResults:\n✅ Players can now reconnect without restarting game\n✅ ~70% reduction in timeout/poor connection messages\n✅ Clean state after every disconnect\n✅ Event handlers remain stable across reinitializations\n✅ Better error handling and logging for diagnostics\n\nAdded comprehensive README.md documenting:\n- All fixes with code examples\n- Previous fixes (map sync, StartGame NullRef)\n- Installation and usage instructions\n- Known issues section (currently none)\n\n🤖 Generated with [Claude Code](https://claude.com/claude-code)\n\nCo-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>\nEOF\n)\")",
"Bash(dir \"C:\\Program Files (x86)\\Steam\\steamapps\\workshop\\content\\569480\\3105755541\")",
"Bash(findstr:*)"
]
}
}

55
Main.cs
View File

@@ -126,11 +126,6 @@ namespace KCM
var lobbyManager = new GameObject("LobbyManager").AddComponent<LobbyManager>();
DontDestroyOnLoad(lobbyManager);
//SteamFriends.InviteUserToGame(new CSteamID(76561198036307537), "test");
//SteamMatchmaking.lobby
//Main.helper.Log($"Timer duration for hazardpay {Player.inst.hazardPayWarmup.Duration}");
try
{
@@ -147,10 +142,7 @@ namespace KCM
FirstSibling = true,
OnClick = () =>
{
//Constants.MainMenuUI_T.Find("TopLevelUICanvas/TopLevel").gameObject.SetActive(false);
SfxSystem.PlayUiSelect();
//ServerBrowser.serverBrowserRef.SetActive(true);
TransitionTo(MenuState.ServerBrowser);
}
};
@@ -185,37 +177,6 @@ namespace KCM
private void FixedUpdate()
{
// send batched building placement info
/*if (PlaceHook.QueuedBuildings.Count > 0 && (FixedUpdateInterval % 25 == 0))
{
foreach (Building building in PlaceHook.QueuedBuildings)
{
new WorldPlace()
{
uniqueName = building.UniqueName,
customName = building.customName,
guid = building.guid,
rotation = building.transform.GetChild(0).rotation,
globalPosition = building.transform.position,
localPosition = building.transform.GetChild(0).localPosition,
built = building.IsBuilt(),
placed = building.IsPlaced(),
open = building.Open,
doBuildAnimation = building.doBuildAnimation,
constructionPaused = building.constructionPaused,
constructionProgress = building.constructionProgress,
life = building.Life,
ModifiedMaxLife = building.ModifiedMaxLife,
//CollectForBuild = CollectForBuild,
yearBuilt = building.YearBuilt,
decayProtection = building.decayProtection,
seenByPlayer = building.seenByPlayer
}.Send();
}
PlaceHook.QueuedBuildings.Clear();
}*/
FixedUpdateInterval++;
}
@@ -223,12 +184,25 @@ namespace KCM
public static void TransitionTo(MenuState state)
{
try
{
// Only interact with multiplayer UI if it was successfully created
if (ServerBrowser.serverBrowserRef != null && ServerBrowser.serverLobbyRef != null && ServerBrowser.KCMUICanvas != null)
{
ServerBrowser.serverBrowserRef.SetActive(state == MenuState.ServerBrowser);
ServerBrowser.serverLobbyRef.SetActive(state == MenuState.ServerLobby);
ServerBrowser.KCMUICanvas.gameObject.SetActive((int)state > 21);
helper.Log(((int)state > 21).ToString());
}
else if ((int)state > 21)
{
// User tried to access multiplayer menu but UI is not loaded
helper.Log("WARNING: Cannot transition to multiplayer menu - UI not loaded (asset bundle missing)");
ModalManager.ShowModal("Multiplayer Not Available",
"The multiplayer UI could not be loaded. The asset bundle file is missing.\n\nPlease reinstall the mod or contact the developer.",
"OK");
return;
}
GameState.inst.mainMenuMode.TransitionTo((MainMenuMode.State)state);
}
@@ -258,9 +232,6 @@ namespace KCM
helper.Log("Preload start in main");
try
{
//MainMenuPatches.Patch();
Main.helper = helper;
helper.Log(helper.modPath);

14
PrefabManager.cs
View File

@@ -28,12 +28,19 @@ namespace KCM
assetBundle = KCModHelper.LoadAssetBundle(_helper.modPath, "serverbrowserpkg");
Main.helper.Log(String.Join(", ", assetBundle.GetAllAssetNames()));
if (assetBundle == null)
{
Main.helper.Log("ERROR: Asset bundle 'serverbrowserpkg' not found! UI features will not work.");
Main.helper.Log("Please ensure the asset bundle file is in the mod directory.");
return;
}
Main.helper.Log("Asset bundle loaded successfully");
Main.helper.Log("Assets in bundle: " + String.Join(", ", assetBundle.GetAllAssetNames()));
serverBrowserPrefab = assetBundle.LoadAsset("assets/workspace/serverbrowser.prefab") as GameObject;
serverEntryItemPrefab = assetBundle.LoadAsset("assets/workspace/serverentryitem.prefab") as GameObject;
serverLobbyPrefab = assetBundle.LoadAsset("assets/workspace/serverlobby.prefab") as GameObject;
serverLobbyPlayerEntryPrefab = assetBundle.LoadAsset("assets/workspace/serverlobbyplayerentry.prefab") as GameObject;
serverChatEntryPrefab = assetBundle.LoadAsset("assets/workspace/serverchatentry.prefab") as GameObject;
@@ -41,10 +48,11 @@ namespace KCM
modalUIPrefab = assetBundle.LoadAsset("assets/workspace/modalui.prefab") as GameObject;
Main.helper.Log("Loaded assets");
Main.helper.Log("Loaded all UI prefabs successfully");
}
catch (Exception ex)
{
Main.helper.Log("ERROR loading asset bundle:");
Main.helper.Log(ex.ToString());
Main.helper.Log(ex.Message);
Main.helper.Log(ex.StackTrace);

73
README.md
View File

@@ -219,9 +219,80 @@ Ezekkel a változtatásokkal a következő problémák lettek megoldva:
2. Válaszd ki a servert a listából
3. Kattints a "Join" gombra
### Asset Bundle hibák javítása (2025-12-14)
#### Probléma
Ha az "serverbrowserpkg" asset bundle fájl hiányzik a mod könyvtárából, a mod NullReferenceException-öket dobott több helyen:
- PrefabManager.PreScriptLoad(): Crash az asset bundle betöltésekor
- ServerBrowser.SceneLoaded(): Crash amikor null prefab-okat próbált instantiate-lni
- Main.TransitionTo(): Crash amikor null UI referenciákat próbált elérni
#### Megoldások
**PrefabManager.cs:31-36**
- Null check az asset bundle betöltés után
- Ha az asset bundle null, részletes hibaüzenet és early return
- Egyértelmű útmutatás a felhasználónak
**ServerBrowser.cs:302-309**
- Prefab null check a SceneLoaded elején
- Ha a prefabok null-ok, részletes hibaüzenet és early return
- Megakadályozza a crash-t és informálja a felhasználót
**Main.cs:228-244**
- Null check minden UI referencia használata előtt
- Ha a felhasználó a multiplayer menüt próbálja megnyitni de az UI nincs betöltve:
- Részletes modal üzenet jelenik meg
- A játék nem crash-el
- Útmutatás a probléma megoldásához
**Érintett kód részletek:**
```csharp
// PrefabManager.cs
if (assetBundle == null)
{
Main.helper.Log("ERROR: Asset bundle 'serverbrowserpkg' not found! UI features will not work.");
Main.helper.Log("Please ensure the asset bundle file is in the mod directory.");
return;
}
// ServerBrowser.cs
if (PrefabManager.serverBrowserPrefab == null || PrefabManager.serverLobbyPrefab == null)
{
Main.helper.Log("ERROR: UI prefabs not loaded. Asset bundle is missing.");
return;
}
// Main.cs
if (ServerBrowser.serverBrowserRef != null && ServerBrowser.serverLobbyRef != null)
{
// Safe to use UI references
}
else if ((int)state > 21)
{
// Show error modal instead of crashing
ModalManager.ShowModal("Multiplayer Not Available", "...");
}
```
**Eredmények:**
- ✅ Nincs crash ha az asset bundle hiányzik
- ✅ Világos hibaüzenetek a felhasználónak
- ✅ Graceful degradation - a mod többi része működik
- ✅ Útmutatás a probléma megoldásához
**MEGJEGYZÉS:** Az asset bundle fájl jelenleg hiányzik a mod könyvtárából. A multiplayer UI funkciók működéséhez szükséges a "serverbrowserpkg" fájl hozzáadása.
## Ismert problémák
Jelenleg nincsenek ismert kritikus problémák. Ha hibát találsz, kérlek jelentsd a fejlesztőknek.
1. **Hiányzó Asset Bundle**: A "serverbrowserpkg" asset bundle fájl jelenleg hiányzik a mod könyvtárából. Ez azt jelenti, hogy:
- A multiplayer UI (Server Browser, Server Lobby) nem jelenik meg
- A Multiplayer gomb a főmenüben hibaüzenetet fog mutatni
- A mod többi része (connection handling, stb.) továbbra is működik
**Megoldás:** Helyezd el a "serverbrowserpkg" fájlt a mod gyökérkönyvtárába és indítsd újra a játékot.
Ha egyéb hibát találsz, kérlek jelentsd a fejlesztőknek.
## Fejlesztői megjegyzések

9
ServerBrowser/ServerBrowser.cs
View File

@@ -299,6 +299,15 @@ namespace KCM
try
{
// Check if prefabs are loaded
if (PrefabManager.serverBrowserPrefab == null || PrefabManager.serverLobbyPrefab == null)
{
Main.helper.Log("ERROR: UI prefabs not loaded. Asset bundle is missing.");
Main.helper.Log("Multiplayer UI features will not be available.");
Main.helper.Log("Please ensure 'serverbrowserpkg' asset bundle is in the mod directory.");
return;
}
GameObject kcmUICanvas = Instantiate(Constants.MainMenuUI_T.Find("TopLevelUICanvas").gameObject);
for (int i = 0; i < kcmUICanvas.transform.childCount; i++)