diff -r 63ff8fe3a8f0 -r 8f4bad72d8b1 hgext/schemes.py
--- a/hgext/schemes.py	Fri Dec 02 21:38:57 2011 -0200
+++ b/hgext/schemes.py	Sun Dec 04 18:22:25 2011 +0100
@@ -72,9 +72,10 @@
         return hg._peerlookup(url).instance(ui, url, create)
 
 def hasdriveletter(orig, path):
-    for scheme in schemes:
-        if path.startswith(scheme + ':'):
-            return False
+    if path:
+        for scheme in schemes:
+            if path.startswith(scheme + ':'):
+                return False
     return orig(path)
 
 schemes = {