Index: /issm/trunk-jpl/src/m/classes/stressbalance.m
===================================================================
--- /issm/trunk-jpl/src/m/classes/stressbalance.m	(revision 18578)
+++ /issm/trunk-jpl/src/m/classes/stressbalance.m	(revision 18579)
@@ -141,5 +141,5 @@
 
 			%singular solution
-			if ~(any(~isnan(md.stressbalance.spcvx)) | any(~isnan(md.stressbalance.spcvy))),
+			if ((~(any(~isnan(md.stressbalance.spcvx)) | any(~isnan(md.stressbalance.spcvy)))) & ~any(md.mask.groundedice_levelset>0)),
 				md = checkmessage(md,['model is not well posed (singular). You need at least one node with fixed velocity!']);
 			end