Twenty Seventeen is throwing a JS error on page display when a sidebar hasn't been setup.

[krmoorhouse]

Error as it appears in the console:

Uncaught TypeError: Cannot read property 'top' of undefined
at belowEntryMetaClass (global.js?ver=1.0:124)
at global.js?ver=1.0:240

I was able to trace the issue to sidebarPos being "undefined" on this line.

sidebarPosBottom = sidebarPos.top + ( $sidebar.height() + 28 );

[sabernhardt]

Sorry your ticket did not receive more attention earlier.

This looks like the issue on #53512, which was just fixed for WordPress 5.8. Please verify whether it works now.

[sabernhardt]

I was hoping for confirmation that the issue is fixed now, but I'll close the ticket as a duplicate of #53512.

If I'm wrong (about this) and the problem still occurs, please reopen the ticket.