diff --git a/modoboa/core/extensions.py b/modoboa/core/extensions.py
index 6ec8010f4..e7e552a04 100644
--- a/modoboa/core/extensions.py
+++ b/modoboa/core/extensions.py
@@ -75,18 +75,18 @@ class ExtensionsPool(object):
         if extinstance is None:
             return None
         result = None
-        #try:
-        baseurl = (
-            extinstance.url if extinstance.url is not None
-            else name
-        )
-        result = (
-            url(r'^%s/' % (baseurl),
-                include("{0}.urls".format(name), namespace=name))
-        )
-        #except ImportError:
+        try:
+            baseurl = (
+                extinstance.url if extinstance.url is not None
+                else name
+            )
+            result = (
+                url(r'^%s/' % (baseurl),
+                    include("{0}.urls".format(name), namespace=name))
+            )
+        except ImportError:
             # No urls for this extension
-        #    pass
+            pass
         extinstance.load()
         return result