diff -r b4887d0680a4 -r b1f2659c1c34 hgext/phabricator.py
--- a/hgext/phabricator.py	Thu Jul 30 16:52:12 2020 +0100
+++ b/hgext/phabricator.py	Thu Jul 30 16:58:38 2020 +0100
@@ -238,8 +238,9 @@
 
     def decorate(fn):
         def inner(*args, **kwargs):
-            if kwargs.get('test_vcr'):
-                cassette = pycompat.fsdecode(kwargs.pop('test_vcr'))
+            vcr = kwargs.pop('test_vcr')
+            if vcr:
+                cassette = pycompat.fsdecode(vcr)
                 import hgdemandimport
 
                 with hgdemandimport.deactivated():