Error when checking Access to a Report

Having the same problem.  I went to share the report, and clicked on the "Access" link.  Upon receiving the error screen, I clicked "ok" (or cancel, or whatever it was) and then at the bottom, clicked "Manage Permissions".  Within this list of people, there was a blank entry.  I clicked the "..." of the blank entry and selected "Remove Access".  Once that blank entry was removed, I was able to open the "Access" screen for the report.