Index: /issm/trunk/src/m/model/ismodelselfconsistent.m
===================================================================
--- /issm/trunk/src/m/model/ismodelselfconsistent.m	(revision 6175)
+++ /issm/trunk/src/m/model/ismodelselfconsistent.m	(revision 6176)
@@ -51,4 +51,7 @@
 else
 	checksize(md,fields,[md.numberofelements 6]);
+end
+if any(~ismember(1:md.numberofgrids,sort(unique(md.elements(:)))));
+	error('orphan nodes have been found. Check the mesh');
 end
 %}}}