diff --git a/firmware/data/bottom.js b/firmware/data/bottom.js
index e70fdf7..62474ca 100644
--- a/firmware/data/bottom.js
+++ b/firmware/data/bottom.js
@@ -451,6 +451,11 @@ showToast('Error while verifying timing control data. The timestamps are not inc
 return null;
 }
 }
+if (tcdata[0].ch1 > 0 || tcdata[0].ch2 > 0 || tcdata[0].ch3 > 0 || tcdata[0].ch4 > 0 ||
+tcdata[9].ch1 > 0 || tcdata[9].ch2 > 0 || tcdata[9].ch3 > 0 || tcdata[9].ch4 > 0) {
+showToast('Error: Values for ch1 to ch4 must be 0 for i=0 and i=9.', 'error');
+return null;
+}
 var currentTime = {hour: new Date().getHours(), min: new Date().getMinutes()};
 var jsonData = {tcdata: tcdata, currenttime: currentTime};
 return JSON.stringify(jsonData);
diff --git a/firmware/html/bottom.js b/firmware/html/bottom.js
index 6b2a8fc..189f7ba 100644
--- a/firmware/html/bottom.js
+++ b/firmware/html/bottom.js
@@ -559,7 +559,14 @@ function createJsonFromTable() {
         return null;
       }
     }
-  
+
+    // Überprüft die Werte für ch1 bis ch4 bei i=0 und i=9
+    if (tcdata[0].ch1 > 0 || tcdata[0].ch2 > 0 || tcdata[0].ch3 > 0 || tcdata[0].ch4 > 0 ||
+        tcdata[9].ch1 > 0 || tcdata[9].ch2 > 0 || tcdata[9].ch3 > 0 || tcdata[9].ch4 > 0) {
+        showToast('Error: Values for ch1 to ch4 must be 0 for i=0 and i=9.', 'error');
+        return null;
+    }
+
     var currentTime = {hour: new Date().getHours(), min: new Date().getMinutes()};
     var jsonData = {tcdata: tcdata, currenttime: currentTime};
     //console.log("jsonData = " + JSON.stringify(jsonData));