Index: branches/trigger_burst_research/sketch.py
===================================================================
--- branches/trigger_burst_research/sketch.py	(revision 18293)
+++ branches/trigger_burst_research/sketch.py	(revision 18294)
@@ -96,8 +96,11 @@
             last_night = this_run['fNight']
 
-        mask = (
-            (trigger_rates['Time'] > fjd(this_run['fRunStart'])) *
-            (trigger_rates['Time'] < fjd(this_run['fRunStop']))
-            )
+        try:
+            mask = (
+                (trigger_rates['Time'] > fjd(this_run['fRunStart'])) *
+                (trigger_rates['Time'] < fjd(this_run['fRunStop']))
+                )
+        except ValueError:
+            continue
         
         if mask.sum() == 0: