Index: /issm/trunk-jpl/src/c/classes/Node.cpp
===================================================================
--- /issm/trunk-jpl/src/c/classes/Node.cpp	(revision 17322)
+++ /issm/trunk-jpl/src/c/classes/Node.cpp	(revision 17323)
@@ -454,4 +454,5 @@
 	/*Put dof for this node into the f set (ie, this dof will NOT be constrained 
 	 * to a fixed value during computations. */
+	_assert_(dof<this->indexing.gsize);
 
 	if(this->indexing.f_set[dof] == 0){