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[AndromAK]

When I post a comment, there is a critical error and the following message:

Il y eu une erreur lors de l'exécution de la requête.
(There was an error during the query execution)

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I deleted all  comments as an admin, and i could test and post a new comment without error, but the second time i post one, there is the same message... (and I noticed that the first comment wasn't shown in the caption of the image)

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here is the debug log...

While executing query "INSERT INTO gallery_comments (pid, msg_author, msg_body, msg_date, author_md5_id, author_id, msg_raw_ip, msg_hdr_ip) VALUES ('92', 'test', 'test', NOW(), 'aec310c6278d4d1471e5c5879f12c228', '0', '86.201.165.219', '86.201.165.219')" on 0

mySQL error: Duplicate entry '0' for key 1

Thank you very much for your help...

[Nibbler]

Look at the gallery_comments table using phpmyadmin and verify that the msg_id field is set as auto_increment.

[AndromAK]

Thank you very much for your VERY quick answer

and you were right!! 
msg_id field wasn't set to auto_increment

There isn't any problem anymore, and comments can be added.

I wonder how this value was changed...    perhaps I did something wrong when I imported the tables...

Thank you very much, again!

[Nibbler]

You might like to check other fields that are supposed to be auto_increment and make sure they are. Check the schema.sql in the sql directory.