KeyError: 'last-modified'

[jhavens12]

Describe the bug
KeyError when run

To Reproduce
Steps to reproduce the behavior:
/usr/local/bin/instaloader --login=XX --sessionfile=/mnt/insta/.instaloader-session --fast-update --no-metadata-json --no-captions --stories --highlights --tagged XXX

Error messages and tracebacks
Traceback (most recent call last):
File "/usr/local/bin/instaloader", line 9, in
load_entry_point('instaloader==4.1', 'console_scripts', 'instaloader')()
File "/usr/local/lib/python3.5/dist-packages/instaloader/main.py", line 388, in main
storyitem_filter_str=args.storyitem_filter)
File "/usr/local/lib/python3.5/dist-packages/instaloader/main.py", line 171, in _main
download_stories, fast_update, post_filter, storyitem_filter)
File "/usr/local/lib/python3.5/dist-packages/instaloader/instaloader.py", line 823, in download_profiles
self.download_profilepic(profile)
File "/usr/local/lib/python3.5/dist-packages/instaloader/instaloader.py", line 281, in download_profilepic
date_object = datetime.strptime(anonymous_session.head(profile_pic_url).headers["Last-Modified"],
File "/usr/local/lib/python3.5/dist-packages/requests/structures.py", line 54, in getitem
return self._store[key.lower()][1]
KeyError: 'last-modified'

Instaloader version
4.1

[jhavens12]

Also reproduce-able with 4.1.1

[aandergr]

Does this problem still persist? I cannot reproduce it currently, neither did it occur during our daily unit tests.

[a1johnson]

I have the same problem using version 4.1.1. The error occurs while downloading of a lot of profile pics, during the download of a few profile pics the error never occurs.

[marlosotavio]

It happens to me too. Ignore the instagram profile theme/photos (lol), but I receive the error only when gathering this single profile of 350. It is open to everyone so it shouldn't have any issue.

-> instaloader.exe --dirname-pattern={profile} --filename-pattern="{profile} - {shortcode}" --no-captions --no-metadata-json acrodave
Traceback (most recent call last):
File "C:\Instaloader_main_.py", line 442, in
File "C:\Instaloader_main_.py", line 438, in main
File "C:\Instaloader_main.py", line 413, in main
File "C:\Instaloader_main.py", line 187, in _main
File "C:\Instaloader\instaloader\instaloader.py", line 903, in download_profiles
File "C:\Instaloader\instaloader\instaloader.py", line 296, in download_profilepic
File "C:\Users\Koch-\AppData\Local\Programs\Python\Python36\lib\site-packages\requests\structures.py", line 54, in getitem
KeyError: 'last-modified'
[11244] Failed to execute script main

Edit: Using latest windows release (4.2) and tried with other parameters, like -F.

[aandergr]

@hgkmaxymus Thanks for reporting and for mentioning a profile where that happens, making it possible for us to fix the bug with commit 4bc0a94. Now, in case the last modified timestamp of the profile pic is not available, a hash is used in the profile pic filename.

Upgrade Instaloader with

pip3 install --upgrade git+https://github.com/instaloader/instaloader