Index: /issm/trunk-jpl/src/m/classes/model.m
===================================================================
--- /issm/trunk-jpl/src/m/classes/model.m	(revision 24510)
+++ /issm/trunk-jpl/src/m/classes/model.m	(revision 24511)
@@ -733,4 +733,7 @@
 				help extrude;
 				error('extrude error message');
+			end
+			if numel(md.geometry.base)~=md.mesh.numberofvertices || numel(md.geometry.surface)~=md.mesh.numberofvertices
+				error('model has not been parameterized yet: base and/or surface not set');
 			end