fix: multiple attempt to bind signal

SlayTheSpire2.LAN.Multiplayer/Patchs/Screens/NOverlayStackPatch.cs

@@ -0,0 +1,33 @@
+using Godot;
+using HarmonyLib;
+using MegaCrit.Sts2.Core.Nodes.Screens.Overlays;
+
+// ReSharper disable UnusedMember.Global
+// ReSharper disable UnusedType.Global
+
+namespace SlayTheSpire2.LAN.Multiplayer.Patchs.Screens
+{
+    [HarmonyPatch(typeof(NOverlayStack), "Remove")]
+    internal class NOverlayStackRemovePatch
+    {
+        private static bool Prefix(NOverlayStack __instance, NOverlay overlay)
+        {
+            if (overlay == null || !GodotObject.IsInstanceValid(overlay))
+            {
+                return false;
+            }
+
+            var connections = overlay.GetSignalConnectionList("Completed");
+            foreach (var connection in connections)
+            {
+                if (connection["callable"].AsCallable().Target == __instance)
+                {
+                    Plugin.Logger?.LogWarning("NOverlayStack.Remove called twice, preventing crash.");
+                    return false;
+                }
+            }
+
+            return true;
+        }
+    }
+}