Index: /issm/trunk-jpl/src/m/classes/model.js
===================================================================
--- /issm/trunk-jpl/src/m/classes/model.js	(revision 21039)
+++ /issm/trunk-jpl/src/m/classes/model.js	(revision 21040)
@@ -203,5 +203,5 @@
             }
 
-            if (md.mesh.domaintype() !== '3D') {
+            if (md.mesh.domaintype() === '3D') {
                 console.error('Cannot extrude a 3d mesh (extrude cannot be called more than once)');
             }