Warning: Attempt to read property "nodeValue" on null

[harmtemolder]

Copied from wallabag/wallabag#7477:

Hello

This article seems to import fine, but when I do an ePub export I get the error “502 Bad Gateway”. > This doesn’t seem to happen elsewhere, even for articles from the same site.

Is this something you can help with?

Many thanks

Tom

https://www.theguardian.com/books/article/2024/may/09/if-you-live-to-100-you-might-as-well-be-happy-what-poverty-jail-and-war-have-taught-author-rhee-kun-hoo?CMP=Share_iOSApp_Other

This is the relevant log (running on Docker):

2025/01/14 07:10:28 [error] 51#51: *2038 FastCGI sent in stderr: "PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core/EPub.php on line 904PHP message: PHP Warning:  Attempt to read property "nodeValue" on null in /var/www/wallabag/vendor/wallabag/phpepub/src/PHPePub/Core
2025/01/14 07:10:28 [error] 51#51: *2038 upstream sent too big header while reading response header from upstream, client: REDACTED, server: _, request: "GET /export/3609.epub HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "REDACTED", referrer: "https://REDACTED/view/3609"
REDACTED - - [14/Jan/2025:07:10:28 +0000] "GET /export/3609.epub HTTP/1.1" 502 150 "https://REDACTED/view/3609" "REDACTED"

On a locally running clone of master, this is line 904 of EPub.php:

$source = $img->attributes->getNamedItem("src")->nodeValue;

So something to do with an image and its src attribute…