Index: /issm/trunk-jpl/src/c/classes/Vertex.cpp
===================================================================
--- /issm/trunk-jpl/src/c/classes/Vertex.cpp	(revision 22785)
+++ /issm/trunk-jpl/src/c/classes/Vertex.cpp	(revision 22786)
@@ -32,6 +32,9 @@
 	this->domaintype     = iomodel->domaintype;
 
-	this->latitute     = iomodel->Data("md.mesh.lat")[i];
-	this->longitude    = iomodel->Data("md.mesh.long")[i];
+	if(iomodel->Data("md.mesh.lat") && iomodel->Data("md.mesh.long")){
+		_assert_(iomodel->Data("md.mesh.lat") && iomodel->Data("md.mesh.long"));
+		this->latitute     = iomodel->Data("md.mesh.lat")[i];
+		this->longitude    = iomodel->Data("md.mesh.long")[i];
+	}
 
 	switch(iomodel->domaintype){