Index: src/routes/posts.js
===================================================================
--- src/routes/posts.js	(revision af2cc73521f992262ee6ca7ac0e77172bcaf9884)
+++ src/routes/posts.js	(revision e311202e61b8a8e0ce2a0f0f23d873495f89d76f)
@@ -1534,5 +1534,5 @@
 router.post('/blocking/remove', requireSiteManager, (req, res) => {
   const site = res.locals.site;
-  if (site) { try { ActivityPubService.unblock(site, (req.body.target || '').toString()); } catch (e) { /* ignore */ } }
+  if (site) { try { ActivityPubService.unblock(site, (req.body.target || '').toString()).catch(() => {}); } catch (e) { /* ignore */ } }
   res.redirect('/blocking?success=' + encodeURIComponent('Deblokkeerd'));
 });