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 = [];