Fix a crash that happens if we were looking at a PV line while new information came in.

[remoteglot] / www / js / remoteglot.js

diff --git a/www/js/remoteglot.js b/www/js/remoteglot.js
index d259e272f9d9229a95e11a8bc2ac53a12835846e..8bb49d27a539f4c14ae5d567b0e54b0c079c092f 100644 (file)
--- a/www/js/remoteglot.js
+++ b/www/js/remoteglot.js
@@ -33,8 +33,12 @@ var request_update = function(board) {
 
 var clear_arrows = function() {
        for (var i = 0; i < arrows.length; ++i) {
-               jsPlumb.detach(arrows[i].connection1);
-               jsPlumb.detach(arrows[i].connection2);
+               if (arrows[i].connection1) {
+                       jsPlumb.detach(arrows[i].connection1);
+               }
+               if (arrows[i].connection2) {
+                       jsPlumb.detach(arrows[i].connection2);
+               }
        }
        arrows = [];