Index: trunk/FACT++/src/ratecontrol.cc
===================================================================
--- trunk/FACT++/src/ratecontrol.cc	(revision 12485)
+++ trunk/FACT++/src/ratecontrol.cc	(revision 12488)
@@ -261,5 +261,8 @@
         // If any is zero there is something wrong
         if (mb==0 || db==0)
-            return;
+        {
+            Warn("The median or the deviation of all board rates is zero... cannot calibrate.");
+            return;
+        }
 
         double avg = 0;