JSON Error after updating to 2.8.6. #560

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opened 2026-10-05 00:04:13 +02:00 by adam · 21 comments

adam commented 2026-10-05 00:04:13 +02:00

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Hi,
after updating to 2.8.6 I get an error when I use the user-manager
"DataTables warning (table id = 'userList'): DataTables warning: JSON data from server could not be parsed. This is caused by a JSON formatting error"

What´s wrong?

best regards
Jörg

Hi, after updating to 2.8.6 I get an error when I use the user-manager "DataTables warning (table id = 'userList'): DataTables warning: JSON data from server could not be parsed. This is caused by a JSON formatting error" What´s wrong? best regards Jörg <!-- github-sync-id:203629076 -->

adam closed this issue 2026-10-05 00:04:13 +02:00

adam commented 2026-10-05 00:04:14 +02:00

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We need more details because this is just the generic message when Piwigo displays an error in the ajax call.

With Firefox, right-click on the page and "inspect element". Then go to the "network" tab, refresh the page and click on the "user_list_backend.php" line, to see what is the exact output.

We need more details because this is just the generic message when Piwigo displays an error in the ajax call. With Firefox, right-click on the page and "inspect element". Then go to the "network" tab, refresh the page and click on the "user_list_backend.php" line, to see what is the exact output.  <!-- github-comment-id:275661409 -->

adam commented 2026-10-05 00:04:15 +02:00

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And also in the topline (you see on pic1):
Warning: session_start(): Failed to read session data: user (path: d:\session) in E:\db-webs\becker.pics\include\common.inc.php on line 149

best regards

Jörg

  And also in the topline (you see on pic1): Warning: session_start(): Failed to read session data: user (path: d:\session) in E:\db-webs\becker.pics\include\common.inc.php on line 149 best regards Jörg <!-- github-comment-id:275662625 -->

adam commented 2026-10-05 00:04:16 +02:00

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OK, so the important here is this warning "Warning: session_start()" it breaks the parsing for the user list. Fix this and your user list will come back.

What can be wrong with d:\session ?

OK, so the important here is this warning "Warning: session_start()" it breaks the parsing for the user list. Fix this and your user list will come back. What can be wrong with d:\session ? <!-- github-comment-id:275663080 -->

adam commented 2026-10-05 00:04:16 +02:00

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The joke is: there is no drive d:
and nothing shows to that

The joke is: there is no drive d:\ and nothing shows to that <!-- github-comment-id:275663358 -->

adam commented 2026-10-05 00:04:17 +02:00

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Hello
what is you environment? OS, server type, php version etc

Hello what is you environment? OS, server type, php version etc <!-- github-comment-id:275663407 -->

adam commented 2026-10-05 00:04:18 +02:00

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This error was not before the update!
It is windows Server 2016 - IIS10

This error was not before the update! It is windows Server 2016 - IIS10 <!-- github-comment-id:275663555 -->

adam commented 2026-10-05 00:04:19 +02:00

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please also overwrite the files again with the 2.8.6 ones to be sure Or use Check Files Integrity

please also overwrite the file**s** again with the 2.8.6 ones to be sure Or use Check Files Integrity <!-- github-comment-id:275663578 -->

adam commented 2026-10-05 00:04:20 +02:00

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what file?

what file? <!-- github-comment-id:275663623 -->

adam commented 2026-10-05 00:04:21 +02:00

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http://piwigo.org/forum/viewtopic.php?id=27637 https://github.com/Piwigo/Piwigo/issues/586

http://piwigo.org/forum/viewtopic.php?id=27637 https://github.com/Piwigo/Piwigo/issues/586 <!-- github-comment-id:275663674 -->

adam commented 2026-10-05 00:04:21 +02:00

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Don´t know what file it should be???
PS: It is PHP 7.1

Don´t know what file it should be??? PS: It is PHP 7.1 <!-- github-comment-id:275664040 -->

adam commented 2026-10-05 00:04:22 +02:00

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Oh but you are the original poster of the issue 586!
Does your old workaround with the DB user recreation works again

Oh but you are the original poster of the issue 586! Does your old workaround with the DB user recreation works again <!-- github-comment-id:275664179 -->

adam commented 2026-10-05 00:04:23 +02:00

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I did, and now I have two errors!

Notice: Undefined variable: results in E:\db-webs\becker.pics\include\functions_session.inc.php on line 148

Notice: Trying to get property of non-object in E:\db-webs\becker.pics\include\dblayer\functions_mysqli.inc.php on line 216

I did, and now I have two errors! Notice: Undefined variable: results in E:\db-webs\becker.pics\include\functions_session.inc.php on line 148 Notice: Trying to get property of non-object in E:\db-webs\becker.pics\include\dblayer\functions_mysqli.inc.php on line 216 <!-- github-comment-id:275665164 -->

adam commented 2026-10-05 00:04:24 +02:00

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those are just Notices but still they shouldn't appear. Is there anything not operational?

those are just Notices but still they shouldn't appear. Is there anything not operational? <!-- github-comment-id:275665448 -->

adam commented 2026-10-05 00:04:24 +02:00

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The JSON Error see postings before

The JSON Error see postings before <!-- github-comment-id:275665684 -->

adam commented 2026-10-05 00:04:25 +02:00

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Yeah but the JSON Error happens when debug messages are displayed in the JSON respond so if you lower the level of Php error reporting, it shoudl work.
And your screen shot doesn't show the content of the JSON call but the content of the css file.

Yeah but the JSON Error happens when debug messages are displayed in the JSON respond so if you lower the level of Php error reporting, it shoudl work. And your screen shot doesn't show the content of the JSON call but the content of the css file. <!-- github-comment-id:275666266 -->

adam commented 2026-10-05 00:04:26 +02:00

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 <!-- github-comment-id:275666708 -->

adam commented 2026-10-05 00:04:26 +02:00

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Then go to the "network" tab, refresh the page and click on the "user_list_backend.php" line, to see what is the exact output.

> Then go to the "network" tab, refresh the page and click on the "user_list_backend.php" line, to see what is the exact output. <!-- github-comment-id:275666869 -->

adam commented 2026-10-05 00:04:27 +02:00

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 <!-- github-comment-id:275667618 -->

adam commented 2026-10-05 00:04:28 +02:00

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Almost there Now Antwort

Almost there Now Antwort <!-- github-comment-id:275667897 -->

adam commented 2026-10-05 00:04:28 +02:00

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whats that????? I did nothing and the error is away???????

whats that????? I did nothing and the error is away??????? <!-- github-comment-id:275669356 -->

adam commented 2026-10-05 00:04:29 +02:00

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I think that the clues points toward an instability of the server. Your installation might not be totally reliable especially the mysql server. Then maybe a caching issue maintains the error a little longer after it has been fixed. But by far I'm not the most skilled one from the team.

I think that the clues points toward an instability of the server. Your installation might not be totally reliable especially the mysql server. Then maybe a caching issue maintains the error a little longer after it has been fixed. But by far I'm not the most skilled one from the team. <!-- github-comment-id:275670195 -->

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Reference: adam/Piwigo#560