diff --git a/web/app/assets/javascripts/configureTracksHelper.js b/web/app/assets/javascripts/configureTracksHelper.js
index 0d17ac918..2fe4260c0 100644
--- a/web/app/assets/javascripts/configureTracksHelper.js
+++ b/web/app/assets/javascripts/configureTracksHelper.js
@@ -247,10 +247,11 @@
           unassignOutputChannel($channel);
         }
         else {
-          var $output = $outputChannelHolder.find('.output[data-num="' + index + '"]')
+          var $output = $outputChannelHolder.find('.output[data-num="' + outputAssignment + '"]');
+          outputAssignment++;
 
           if($output.length == 0) {
-            context.JK.alertSupportedNeeded('Unable to find an output for channel with assignment ' + outputChannel.assignment);
+            context.JK.alertSupportedNeeded('Unable to find an output holder for channel: ' + outputChannel.id + ' with assignment ' + outputChannel.assignment);
             return false;
           }
           addChannelToOutput($channel, $output.find('.output-target'));