Index: /issm/trunk-jpl/src/c/Container/Observations.cpp
===================================================================
--- /issm/trunk-jpl/src/c/Container/Observations.cpp	(revision 14069)
+++ /issm/trunk-jpl/src/c/Container/Observations.cpp	(revision 14070)
@@ -45,4 +45,7 @@
 	IssmPDouble  offset,minlength,minspacing,mintrimming,maxtrimming;
 	Observation *observation = NULL;
+
+	/*Check that observations is not empty*/
+	if(n==0) _error_("No observation found");
 
 	/*Get extrema*/