This bug was fixed in the package openbox - 3.6.1-7ubuntu1
--------------- openbox (3.6.1-7ubuntu1) cosmic; urgency=medium
* Fix applications menu when there are no entries (LP: #1771696).
-- Simon Quigley <email address hidden> Thu, 17 May 2018 19:50:05 -0500
This bug was fixed in the package openbox - 3.6.1-7ubuntu1
---------------
openbox (3.6.1-7ubuntu1) cosmic; urgency=medium
* Fix applications menu when there are no entries (LP: #1771696).
-- Simon Quigley <email address hidden> Thu, 17 May 2018 19:50:05 -0500