Welcome to the Splat alpha!

I looked into this a bit when you reported this to me, and... the cause of that UnboundLocalError is easily fixed, but it shouldn't be hitting that code to begin with unless it'd be in a state where j would be assigned. So there's a real bug with that function, but also something leading to that function being called. Kinda weird. Going to require some investigation.

The error:

Traceback (most recent call last):
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/views.py", line 447, in get
    response = renderer.render_to_response(request)
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/renderers.py", line 57, in render_to_response
    return HttpResponse(self.render_to_string(request))
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/renderers.py", line 72, in render_to_string
    return cache_memoize(
  File "/venv/lib/python3.8/site-packages/djblets/cache/backend.py", line 312, in cache_memoize
    results = list(cache_memoize_iter(key,
  File "/venv/lib/python3.8/site-packages/djblets/cache/backend.py", line 254, in cache_memoize_iter
    items = items_or_callable()
  File "/venv/lib/python3.8/site-packages/djblets/cache/backend.py", line 313, in <lambda>
    lambda: [lookup_callable()],
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/renderers.py", line 74, in <lambda>
    lambda: self.render_to_string_uncached(request),
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/renderers.py", line 87, in render_to_string_uncached
    populate_diff_chunks([self.diff_file], self.highlighting,
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/diffutils.py", line 1251, in populate_diff_chunks
    chunks = list(generator.get_chunks())
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/chunk_generator.py", line 996, in get_chunks
    for chunk in super(DiffChunkGenerator, self).get_chunks(cache_key):
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/chunk_generator.py", line 161, in get_chunks
    chunks = cache_memoize(cache_key,
  File "/venv/lib/python3.8/site-packages/djblets/cache/backend.py", line 312, in cache_memoize
    results = list(cache_memoize_iter(key,
  File "/venv/lib/python3.8/site-packages/djblets/cache/backend.py", line 254, in cache_memoize_iter
    items = items_or_callable()
  File "/venv/lib/python3.8/site-packages/djblets/cache/backend.py", line 313, in <lambda>
    lambda: [lookup_callable()],
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/chunk_generator.py", line 162, in <lambda>
    lambda: list(self.get_chunks_uncached()),
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/chunk_generator.py", line 1119, in get_chunks_uncached
    for chunk in self.generate_chunks(old=old,
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/chunk_generator.py", line 305, in generate_chunks
    lines = [
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/chunk_generator.py", line 306, in <listcomp>
    self._diff_line(tag, meta, *diff_args)
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/chunk_generator.py", line 533, in _diff_line
    old_markup, new_markup = self._highlight_indentation(
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/chunk_generator.py", line 600, in _highlight_indentation
    new_markup = self._wrap_indentation_chars(
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/chunk_generator.py", line 646, in _wrap_indentation_chars
    serialized, remainder = serializer(indentation, norm_indent_len_diff)
  File "/venv/lib/python3.8/site-packages/reviewboard/diffviewer/chunk_generator.py", line 688, in _serialize_indentation
    return s, chars[j + 1:]
UnboundLocalError: local variable 'j' referenced before assignment

Didn't test with other authntication provider, but if name are greater than the limitation of the db field lenght, they would get the same error.

Fixed for release-5.0.x (0ded004). This will ship in 5.0.

Fixed for release-5.0.x (cb1f094). This will ship in 5.0.

Fixed for release-5.0.x (0efa050). This will ship in 5.0.

Fixed for release-5.0.x (33d462a). This will ship in 5.0.

Fixed for release-5.0.x (5b22a8e). This will ship in 5.0.

Fixed for release-5.0.x (0c0e034). This will ship in 5.0