fix(network): prevent null multiplayer peer crashes offline/teardown and fix Nakama RPC session validation

scripts/managers/auth_manager.gd

@@ -427,6 +427,9 @@ func link_google(id_token: String) -> bool:
 func logout() -> void:
 	print("[AuthManager] Logging out...")
 	
+	if NakamaManager.client and NakamaManager.session:
+		await NakamaManager.client.session_logout_async(NakamaManager.session)
+
 	# FULL CLEANUP: close socket, leave bridge, clear multiplayer peer
 	NakamaManager.cleanup()
 	

scripts/managers/player_action_manager.gd

@@ -22,7 +22,7 @@ func after_action_completed():
 		return
 	player._is_processing_action = true
 	
-	if player.is_multiplayer_authority():
+	if player.can_rpc() and multiplayer.has_multiplayer_peer():
 		player.update_finish_availability()
 	
 	# Clear the highlights after placing the tiles. (Quickfix for Clientside)
@@ -30,12 +30,12 @@ func after_action_completed():
 	
 	# Only update UI if this is the LOCAL HUMAN PLAYER
 	# Guard against stale callbacks after peer teardown (host quitting solo match)
-	if not multiplayer.has_multiplayer_peer():
+	if not multiplayer or not multiplayer.has_multiplayer_peer():
 		player._is_processing_action = false
 		return
 	if multiplayer.get_unique_id() == player.get_multiplayer_authority():
 		# Sync playerboard (Bots DO need to sync their board logic, just not update local UI)
-		if player.is_multiplayer_authority() and player.has_method("can_rpc") and player.can_rpc():
+		if player.can_rpc() and multiplayer.has_multiplayer_peer():
 			var main = player.get_tree().get_root().get_node_or_null("Main")
 			if main:
 				main.rpc("sync_playerboard", player.name.to_int(), player.playerboard)

scripts/managers/player_input_manager.gd

@@ -99,10 +99,11 @@ func handle_unhandled_input(event):
 				var gm = player.get_node_or_null("/root/Main/CandySurvivalManager")
 				if gm and gm.active:
 					var pid = player.get("peer_id") if "peer_id" in player else player.name.to_int()
-					if multiplayer.is_server():
-						gm.try_activate_ghost(pid)
-					else:
-						gm.rpc_id(1, "try_activate_ghost", pid)
+					if player.can_rpc() and multiplayer.has_multiplayer_peer():
+						if multiplayer.is_server():
+							gm.try_activate_ghost(pid)
+						else:
+							gm.rpc_id(1, "try_activate_ghost", pid)
 			else:
 				player.activate_held_powerup()
 			get_viewport().set_input_as_handled()

scripts/managers/player_movement_manager.gd

@@ -168,9 +168,10 @@ func simple_move_to(grid_position: Vector2i) -> bool:
 	if gm and gm.active and gm.has_method("try_deliver"):
 		var dist = abs(grid_position.x - 8) + abs(grid_position.y - 8)
 		if dist <= 1:
-			if multiplayer.is_server():
-				var pid = player.get("peer_id") if "peer_id" in player else player.name.to_int()
-				gm.try_deliver(pid)
+			if player.can_rpc() and multiplayer.has_multiplayer_peer():
+				if multiplayer.is_server():
+					var pid = player.get("peer_id") if "peer_id" in player else player.name.to_int()
+					gm.try_deliver(pid)
 			
 	rotate_towards_target(grid_position)
 	
@@ -249,10 +250,11 @@ func try_push(target_pos: Vector2i, direction: Vector2i) -> bool:
 	if gm and gm.active and gm.has_method("try_knock"):
 		var pid = player.get("peer_id") if "peer_id" in player else player.name.to_int()
 		var other_pid = other_player.get("peer_id") if "peer_id" in other_player else other_player.name.to_int()
-		if multiplayer.is_server():
-			gm.try_knock(pid, other_pid)
-		else:
-			gm.rpc_id(1, "try_knock", pid, other_pid)
+		if player.can_rpc() and multiplayer.has_multiplayer_peer():
+			if multiplayer.is_server():
+				gm.try_knock(pid, other_pid)
+			else:
+				gm.rpc_id(1, "try_knock", pid, other_pid)
 		# Consume knock mode after use (toggle off)
 		player.is_charged_strike = false
 		return false
@@ -315,7 +317,7 @@ func try_push(target_pos: Vector2i, direction: Vector2i) -> bool:
 					print("[Move] Ghost mode bypassed push-into-sticky at %s" % pushed_to_pos)
 				else:
 					print("[Move] Player pushed into sticky cell at %s — slowed" % pushed_to_pos)
-					if multiplayer.is_server() or other_player.is_multiplayer_authority():
+					if other_player.can_rpc() and multiplayer.has_multiplayer_peer() and (multiplayer.is_server() or other_player.is_multiplayer_authority()):
 						gm_sticky.apply_sticky_slow(other_player)
 		
 	# 2. Apply freeze/stun effect
@@ -342,10 +344,10 @@ func try_push(target_pos: Vector2i, direction: Vector2i) -> bool:
 			if main_score:
 				var gcm = main_score.get_node_or_null("GoalsCycleManager")
 				if gcm:
-					if multiplayer.is_server():
+					if multiplayer.has_multiplayer_peer() and multiplayer.is_server():
 						# Server/Bot: Directly add score to specific player ID
 						gcm.add_score(player.name.to_int(), 200)
-					else:
+					elif player.can_rpc() and multiplayer.has_multiplayer_peer():
 						# Client: Request score add (sender ID used)
 						gcm.rpc("request_add_score", 200)
 			NotificationManager.send_message(player, "Successful Attack! +200 Pts", NotificationManager.MessageType.GOAL)