Index: /issm/trunk/src/m/classes/@plotoptions/buildlist.m
===================================================================
--- /issm/trunk/src/m/classes/@plotoptions/buildlist.m	(revision 2707)
+++ /issm/trunk/src/m/classes/@plotoptions/buildlist.m	(revision 2708)
@@ -65,4 +65,7 @@
 			else
 				%assign to subplot
+				if str2num(plotnum)>numberofplots,
+					error(['plotoptions error message: ' field ' cannot be assigned (' plotnum ' exceed maximum number of plot)']);
+				end
 				plotoptions.list{str2num(plotnum)}=addfield(plotoptions.list{str2num(plotnum)},field,rawoptions.list{i,2});
 			end