Index: /issm/trunk/src/c/objects/Elements/Tria.cpp
===================================================================
--- /issm/trunk/src/c/objects/Elements/Tria.cpp	(revision 7905)
+++ /issm/trunk/src/c/objects/Elements/Tria.cpp	(revision 7906)
@@ -3405,5 +3405,8 @@
 		
 		/*Add gradje_g_gaussian vector to gradje_g: */
-		for( i=0; i<NUMVERTICES; i++)grade_g[i]+=grade_g_gaussian[i];
+		for(i=0;i<NUMVERTICES;i++){
+			_assert_(!isnan(grade_g[i]));
+			grade_g[i]+=grade_g_gaussian[i];
+		}
 	}