Fix panic on disconnect by adding mutex

main.go

@@ -27,6 +27,7 @@ var (
 	players     = make(map[int]*Player)
 	actionQueue = make(map[int][]*pb.Action) // Queue to store actions for each player
 	playerConns = make(map[int]net.Conn)     // Map to store player connections
+	mu          sync.RWMutex                 // Add mutex for protecting shared maps
 )
 
 func main() {
@@ -60,11 +61,12 @@ func main() {
 func handleConnection(conn net.Conn) {
 	defer conn.Close()
 
-	// Assign a new player ID and add the player to the game state
+	mu.Lock()
 	playerID := len(players) + 1
 	newPlayer := &Player{ID: playerID, X: 5, Y: 5}
 	players[playerID] = newPlayer
 	playerConns[playerID] = conn
+	mu.Unlock()
 	fmt.Printf("Player %d connected\n", playerID)
 
 	// Send player ID to the client
@@ -90,6 +92,7 @@ func handleConnection(conn net.Conn) {
 			log.Printf("Error reading from player %d: %v", playerID, err)
 			delete(players, playerID)
 			delete(playerConns, playerID)
+			delete(actionQueue, playerID)
 			return
 		}
 
@@ -107,6 +110,9 @@ func handleConnection(conn net.Conn) {
 }
 
 func processActions() {
+	mu.Lock()
+	defer mu.Unlock()
+
 	// Update players based on queued actions
 	for playerID, actions := range actionQueue {
 		player := players[playerID]