diff --git a/src/xpra/client/gtk_base/start_new_command.py b/src/xpra/client/gtk_base/start_new_command.py
index fd43f2d3d2..6e1defe43a 100755
--- a/src/xpra/client/gtk_base/start_new_command.py
+++ b/src/xpra/client/gtk_base/start_new_command.py
@@ -74,7 +74,7 @@ def __init__(self, run_callback=None, can_share=False):
             self.share.set_active(True)
             vbox.add(self.share)
         else:
-            self.share = False
+            self.share = None
 
         # Buttons:
         hbox = gtk.HBox(False, 20)