diff --git a/docs/prune-simulator/prune-simulator.js b/docs/prune-simulator/prune-simulator.js
index 0ee43dc6..cc3a8db9 100644
--- a/docs/prune-simulator/prune-simulator.js
+++ b/docs/prune-simulator/prune-simulator.js
@@ -353,6 +353,7 @@ Ext.onReady(function() {
 		    minutes = matchTimeSpec(minuteSpec, 0, 59);
 		} catch (err) {
 		    Ext.Msg.alert('Error', err);
+		    return;
 		}
 
 		let backups = me.populateFromSchedule(