Getting internal server error 500 instead of 404, may be related with django-compressor?

I'm using Django with Apache web server. If I put DEBUG=True Django serves 404 debug errors without problem. But when I put DEBUG=False Apache is returning a 500 internal server error when it catch a 404 error. This causes Django to not serve my 404 template (/templates/404.html) and visitor see the apache internel error instead.

This is what I get in apache error log:

[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] mod_wsgi (pid=10629): Exception occurred processing WSGI script '/home/user/WEB/app.wsgi'.
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] Traceback (most recent call last):
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/wsgi.py", line 241, in __call__
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] response = self.get_response(request)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 153, in get_response
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 228, in handle_uncaught_exception
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] return callback(request, **param_dict)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py", line 91, in _wrapped_view
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] response = view_func(request, *args, **kwargs)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/views/defaults.py", line 33, in server_error
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] return http.HttpResponseServerError(t.render(Context({})))
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 140, in render
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] return self._render(context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 134, in _render
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] return self.nodelist.render(context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 823, in render
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] bit = self.render_node(node, context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 837, in render_node
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] return node.render(context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py", line 123, in render
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] return compiled_parent._render(context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 134, in _render
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] return self.nodelist.render(context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 823, in render
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] bit = self.render_node(node, context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 837, in render_node
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] return node.render(context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py", line 62, in render
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] result = block.nodelist.render(context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 823, in render
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] bit = self.render_node(node, context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/django/template/base.py", line 837, in render_node
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] return node.render(context)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/compressor/templatetags/compress.py", line 147, in render
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] return self.render_compressed(context, self.kind, self.mode, forced=forced)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/compressor/templatetags/compress.py", line 88, in render_compressed
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] cached_offline = self.render_offline(context, forced=forced)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] File "/usr/local/lib/python2.7/dist-packages/compressor/templatetags/compress.py", line 72, in render_offline
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] 'You may need to run "python manage.py compress".' % key)
[Mon May 27 13:43:48 2013] [error] [client 10.48.245.115] OfflineGenerationError: You have offline compression enabled but key "f105665b075e961e20cfdab086169332" is missing from offline manifest. You may need to run "python manage.py compress".


I'm using django-compressor with offline compression enabled and running without problems, I'm not getting any kind of errors when loading "normal" pages.
Using Django 1.4 on Ubuntu 12.04.2.

Thanks.

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