When I call following URL ​ https://software.rtcm-ntrip.org/changeset/10236/ntrip/trunk/BNC/src/src.pri?format=diff I get the mentioned error message. This also happens when I deactivate all plugins.

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/trac/web/main.py", line 609, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python3.6/site-packages/trac/web/main.py", line 301, in dispatch
    raise e
  File "/usr/lib/python3.6/site-packages/trac/web/main.py", line 247, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python3.6/site-packages/trac/versioncontrol/web_ui/changeset.py", line 343, in process_request
    self._render_diff(req, filename, repos, data)
  File "/usr/lib/python3.6/site-packages/trac/versioncontrol/web_ui/changeset.py", line 689, in _render_diff
    output = ''.join(output)
TypeError: sequence item 0: expected str instance, bytes found
It is fixed by
Similar URLs on a second Trac instance work, so maybe that needs postgres as database to fail?
Applying the change on the working system with sqlite3 database does no harm.
                    When I call following URL
https://software.rtcm-ntrip.org/changeset/10236/ntrip/trunk/BNC/src/src.pri?format=diff
I get the mentioned error message.
This also happens when I deactivate all plugins.
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/trac/web/main.py", line 609, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python3.6/site-packages/trac/web/main.py", line 301, in dispatch
    raise e
  File "/usr/lib/python3.6/site-packages/trac/web/main.py", line 247, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python3.6/site-packages/trac/versioncontrol/web_ui/changeset.py", line 343, in process_request
    self._render_diff(req, filename, repos, data)
  File "/usr/lib/python3.6/site-packages/trac/versioncontrol/web_ui/changeset.py", line 689, in _render_diff
    output = ''.join(output)
TypeError: sequence item 0: expected str instance, bytes found
It is fixed by
#!diff
--- versioncontrol/web_ui/changeset.py~ 2023-11-07 15:06:06.000000000 +0100
+++ versioncontrol/web_ui/changeset.py  2023-11-07 15:07:03.797373426 +0100
@@ -686,7 +686,7 @@
         if Chrome(self.env).use_chunked_encoding:
             length = None
         else:
-            output = ''.join(output)
+            output = b''.join(output)
             length = len(output)
         req.send_response(200)
Similar URLs on a second Trac instance work, so maybe that needs postgres as database to fail?
Applying the change on the working system with sqlite3 database does no harm.
You may use WikiFormatting
 here.