diff --git a/web/directives/channel-config.js b/web/directives/channel-config.js
index b9008db..e0ce3ca 100644
--- a/web/directives/channel-config.js
+++ b/web/directives/channel-config.js
@@ -1675,7 +1675,7 @@ function validURL(url) {
 }
 
 function checkChannelNumber(number) {
-    if ( /^[1-9][0-9]+$/.test(number) ) {
+    if ( /^(([1-9][0-9]*)|(0))$/.test(number) ) {
         let x = parseInt(number);
         return (0 <= x && x < 10000);
     } else {