Hi,
when running my scraper on scrapinghub I get that all the requests are
registered as failed and the following errors are reported.
```
Traceback (most recent call last):
File "/app/python/lib/python2.7/site-packages/twisted/internet/defer.py",
line 149, in maybeDeferred
result = f(*args, **kw)
File "/usr/local/lib/python2.7/site-packages/pydispatch/robustapply.py",
line 55, in robustApply
return receiver(*arguments, **named)
File "/usr/local/lib/python2.7/site-packages/sh_scrapy/extension.py",
line 39, in item_scraped
item = self.exporter.export_item(item)
File "/app/python/lib/python2.7/site-packages/scrapy/exporters.py", line
304, in export_item
result = dict(self._get_serialized_fields(item))
File "/app/python/lib/python2.7/site-packages/scrapy/exporters.py", line
65, in _get_serialized_fields
field_iter = six.iterkeys(item)
File "/usr/local/lib/python2.7/site-packages/six.py", line 593, in
iterkeys
return d.iterkeys(**kw)
AttributeError: 'NoneType' object has no attribute 'iterkeys'
```
>From the scraping hub dashboard I can see that all items appears as failed
(0 processed), however the scraper seems to work fine and serielizes the
correct data in the database.
Anybody can explain this?
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