--- a/web/res/js/live-polemic.js	Wed Apr 24 18:19:55 2013 +0200
+++ b/web/res/js/live-polemic.js	Tue May 07 18:26:08 2013 +0200
@@ -378,6 +378,7 @@
 
 function trimFDS() {
     var slices = flattenDateStruct(twCx.timeline, twCx.timeLevel);
+    if (!slices.length) { return []; }
     while (slices[0].tweets.length == 0) {
         slices.splice(0,1);
     }