Index: /issm/trunk-jpl/src/m/classes/debris.py
===================================================================
--- /issm/trunk-jpl/src/m/classes/debris.py	(revision 27423)
+++ /issm/trunk-jpl/src/m/classes/debris.py	(revision 27424)
@@ -99,5 +99,5 @@
         md = checkfield(md, 'fieldname', 'debris.requested_outputs', 'stringrow', 1)
 
-        if not np.any(np.isnan(md.stressbalance.vertex_pairing)):
+        if not np.any(np.isnan(md.stressbalance.vertex_pairing)) and len(md.stressbalance.vertex_pairing) > 0:
             md = checkfield(md, 'fieldname', 'stressbalance.vertex_pairing', '>', 0)
         return md
Index: /issm/trunk-jpl/src/m/classes/masstransport.py
===================================================================
--- /issm/trunk-jpl/src/m/classes/masstransport.py	(revision 27423)
+++ /issm/trunk-jpl/src/m/classes/masstransport.py	(revision 27424)
@@ -49,4 +49,5 @@
 
     #}}}
+
     def setdefaultparameters(self):  # {{{
         # Type of stabilization to use 0:nothing 1:artificial_diffusivity 3:Discontinuous Galerkin