Index: /issm/trunk/src/m/classes/public/presolve.m
===================================================================
--- /issm/trunk/src/m/classes/public/presolve.m	(revision 1630)
+++ /issm/trunk/src/m/classes/public/presolve.m	(revision 1631)
@@ -6,6 +6,9 @@
 
 %first, deal with rifts.
-
-md.numrifts=numel(md.rifts);
+if isnan(md.rifts),
+	md.numrifts=0;
+else
+	md.numrifts=numel(md.rifts);
+end
 
 numpairs=0;