Index: /issm/trunk-jpl/src/c/classes/Elements/Tria.cpp
===================================================================
--- /issm/trunk-jpl/src/c/classes/Elements/Tria.cpp	(revision 27295)
+++ /issm/trunk-jpl/src/c/classes/Elements/Tria.cpp	(revision 27296)
@@ -5289,8 +5289,10 @@
 	/*Check hydro timestep also and take the minimum*/
 	if(ishydro){
-		Input* vx_input = this->GetInput(HydrologyWaterVxEnum); _assert_(vx_input);
-		Input* vy_input = this->GetInput(HydrologyWaterVyEnum); _assert_(vy_input);
-		IssmDouble maxabsvx = vx_input->GetInputMaxAbs();
-		IssmDouble maxabsvy = vy_input->GetInputMaxAbs();
+		Input* vx_input = this->GetInput(HydrologyWaterVxEnum);
+		Input* vy_input = this->GetInput(HydrologyWaterVyEnum);
+		IssmDouble maxabsvx = 0.03;
+		IssmDouble maxabsvy = 0.03;
+		if(vx_input) maxabsvx = vx_input->GetInputMaxAbs();
+		if(vy_input) maxabsvy = vy_input->GetInputMaxAbs();
 
 		/*CFL criterion: */