diff --git a/src/ui/modal-ui-handler.ts b/src/ui/modal-ui-handler.ts
index 9340e1c17ed..c6a6cbbd2e1 100644
--- a/src/ui/modal-ui-handler.ts
+++ b/src/ui/modal-ui-handler.ts
@@ -83,7 +83,7 @@ export abstract class ModalUiHandler extends UiHandler {
   show(args: any[]): boolean {
     if (args.length >= 1 && "buttonActions" in args[0]) {
       super.show(args);
-      if ("fadeOut" in args[0]) {
+      if (args[0].hasOwnProperty("fadeOut") && typeof args[0].fadeOut === "function") {
         const overlay = this.scene.add.rectangle((( (this.getWidth() + (this.getMargin()[0] - this.getMargin()[3]))) / 2), ((this.getHeight() + (this.getMargin()[1] - this.getMargin()[2])) / 2),this.scene.game.canvas.width ,this.scene.game.canvas.height , 0);
         overlay.setName("rect-ui-overlay-modal");
         overlay.setAlpha(0);