Armed guys!

level/scripts/enemy_spawner.gd

@@ -236,8 +236,8 @@ func _process(_delta):
 	if _debug_circle:
 		_debug_circle.visible = show_spawn_radius
 
-	# Server spawning logic
-	if not multiplayer.is_server():
+	# Server spawning logic (check peer is assigned first)
+	if multiplayer.multiplayer_peer == null or not multiplayer.is_server():
 		return
 
 	# Handle wave delay timer