From f113b54801e4fd51c9ca34da1fccdae21c3b8870 Mon Sep 17 00:00:00 2001
From: Christian Denker <christian@2denker.de>
Date: Tue, 1 Oct 2024 14:23:34 +0200
Subject: [PATCH] add check if object is defined

---
 index.html | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/index.html b/index.html
index 8c612fd..039dd84 100644
--- a/index.html
+++ b/index.html
@@ -227,14 +227,22 @@
         document.addEventListener('touchend', endDrag);
 
         function startDrag(e) {
-            pollyMessageListener.postMessage('startDrag')
+            if (pollyMessageListener && typeof pollyMessageListener.postMessage === 'function') {
+                pollyMessageListener.postMessage('startDrag');
+            } else {
+                console.warn('pollyMessageListener is not defined or does not support postMessage');
+            }
             isDragging = true;
             e.preventDefault();
             document.getElementById('arrows').style.visibility = 'hidden';
         }
 
         function onDrag(e) {
-            pollyMessageListener.postMessage('onDrag')
+            if (pollyMessageListener && typeof pollyMessageListener.postMessage === 'function') {
+                pollyMessageListener.postMessage('onDrag');
+            } else {
+                console.warn('pollyMessageListener is not defined or does not support postMessage');
+            }
             if (!isDragging) return;
 
             let clientX = e.clientX || e.touches[0].clientX;
@@ -253,8 +261,11 @@
         }
 
         function endDrag() {
-            pollyMessageListener.postMessage('endDrag')
-
+            if (pollyMessageListener && typeof pollyMessageListener.postMessage === 'function') {
+                pollyMessageListener.postMessage('endDrag');
+            } else {
+                console.warn('pollyMessageListener is not defined or does not support postMessage');
+            }
             isDragging = false;
             if (userResult === null) return;
             if (hasSubmitted) {