Mastodon from 1-Click Apps Marketplace - All searches fail with 500 status code

I’ve set up Mastodon on a droplet by following this quickstart guide.

I see no resource contention on my machine, with CPU/Memory usage being low.

Whenever I try to search anything (eg. users in another instance), I get no results, a popup with ‘500’ on the frontent, and the following logs.

$ sudo journalctl -u mastodon-web -f
...
Nov 20 15:24:41 mastodon-tpaschalis bundle[21104]: [6d2871d6-79e6-4012-ac82-d065a31da62d] [paperclip] Trying to link /tmp/87cd3e201ed9ac2aab393bf5a280325120221120-21104-1sayx.png to /tmp/af9f4e282b0b6a8330cabbb89928872e20221120-21104-qxshvi.png
Nov 20 15:24:41 mastodon-tpaschalis bundle[21104]: [6d2871d6-79e6-4012-ac82-d065a31da62d] Command :: file -b --mime '/tmp/af9f4e282b0b6a8330cabbb89928872e20221120-21104-qxshvi.png'
Nov 20 15:24:41 mastodon-tpaschalis bundle[21104]: [6d2871d6-79e6-4012-ac82-d065a31da62d] [paperclip] Trying to link /tmp/87cd3e201ed9ac2aab393bf5a280325120221120-21104-1sayx.png to /tmp/34e15810f90474d7b7a11c274fbfcc8120221120-21104-xqi32r.png

Nov 20 15:24:42 mastodon-tpaschalis bundle[21104]: [6d2871d6-79e6-4012-ac82-d065a31da62d] [paperclip] saving cache/accounts/avatars/109/376/197/039/065/644/original/dd20e7d8622fb15b.png
Nov 20 15:24:42 mastodon-tpaschalis bundle[21104]: [6d2871d6-79e6-4012-ac82-d065a31da62d] method=GET path=/api/v2/search format=html controller=Api::V2::SearchController action=index status=500 error='ArgumentError: expected :endpoint to be a HTTP or HTTPS endpoint' duration=1292.32 view=0.00 db=5.37
Nov 20 15:24:42 mastodon-tpaschalis bundle[21104]: [6d2871d6-79e6-4012-ac82-d065a31da62d]
Nov 20 15:24:42 mastodon-tpaschalis bundle[21104]: [6d2871d6-79e6-4012-ac82-d065a31da62d] ArgumentError (expected :endpoint to be a HTTP or HTTPS endpoint):
Nov 20 15:24:42 mastodon-tpaschalis bundle[21104]: [6d2871d6-79e6-4012-ac82-d065a31da62d]
Nov 20 15:24:42 mastodon-tpaschalis bundle[21104]: [6d2871d6-79e6-4012-ac82-d065a31da62d] lib/paperclip/attachment_extensions.rb:84:in `block in save'
Nov 20 15:24:42 mastodon-tpaschalis bundle[21104]: [6d2871d6-79e6-4012-ac82-d065a31da62d] lib/paperclip/attachment_extensions.rb:90:in `save'
....

I couldn’t find any references to similar behavior anywhere, has anyone got the same issue? I’m running on v3.5.3.

Edit: I’ve updated the Mastodon instance to v3.5.5 using the instructions on the releases page and restarted; the issue still persists with the same error message.