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"Warning: Trying to access array offset on value of type null" when migrating to PHP 8.1 #37

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eduardomozart opened this issue Jan 31, 2023 · 2 comments
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"Warning: Trying to access array offset on value of type null" when migrating to PHP 8.1 #37

eduardomozart opened this issue Jan 31, 2023 · 2 comments

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@eduardomozart
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eduardomozart commented Jan 31, 2023 •
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Hello,

I upgraded my DokuWiki instance to PHP 8.1 (PHP 7.4 is deprecated now) and the following errors are being shown at the top of my Wiki:

Warning: Trying to access array offset on value of type null in /home/robertinho/public_html/wiki/lib/plugins/epub/action.php on line 104

Warning: Cannot modify header information - headers already sent by (output started at /home/robertinho/public_html/wiki/lib/plugins/dw2pdf/action.php:914) in /home/robertinho/public_html/wiki/inc/actions.php on line 38

Disabling the plug-in fixes the issue.

Please let me know if there's any information I can provide to troubleshoot and fix this issue.
@eduardomozart eduardomozart changed the title "Warning: Undefined array key 1" when migrating to PHP 8.1 "Warning: Trying to access array offset on value of type null" when migrating to PHP 8.1 Jan 31, 2023
turnermm added a commit that referenced this issue Jan 31, 2023
@turnermm
Possible fix for issue #37
c9a2e9d
@turnermm
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See if this solves the problem. I can't really test since I am not yet running php 8

@eduardomozart
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Applying your fix seems to dismiss the warning. Thank you!

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@turnermm @eduardomozart