Warning message displays when quickly opening multiple admin detail pages

[danielgregorywilson]

Working in Django 1.11.18 here. I am using BaseGenericModelAdmin for my ObjectiveAdmin class. From the list page in the admin, I command-click to open several objectives (in this case, 1343, 1344, and 1345) in quick succession. For the last of these (1345), I see the attached message "Objective with ID "1343/genericadmin-init" doesn't exist. Perhaps it was deleted?"

Other than this message, nothing seems to be wrong, but it's hard to be sure. My generic relations still display properly, and I can add/remove them as normal. When I reload the page in question, the message does not reappear. The issue is consistent (occurs more often the faster I open pages, sometimes displaying two errors for previous objects).

Thank you!