Mysterious error on trying to print PDF

[shalmaxb]

Hello, recently I have an error in printing PDF in one of my custom entities.
Whenever I try to print a PDF, I get : Error on loading PDF Document (see screenshot).

In the log: WARNING: E_WARNING: DOMDocument::loadHTML(): error parsing attribute name in Entity, line: 70

The mysterious thing is, this happens only in the first record of the list view, when opening to detail view. From other record it is no problem to print as desired.

[shalmaxb]

EDIT: It works from the list view.

[yuri]

Is it reproducible with another PDF template?

[shalmaxb]

It is the same with all PDF templates of that entity and that record.

[yuri]

There're quite a few google results for "error parsing attribute name in Entity" query. The error is related to HTML parsing. I didn't have a chance to look into.

[shalmaxb]

I read some of the articles about parsing and it often refers to the HTML tagging, which could have an error. But although looking to solve this problem the last few hours, I do not get it to work.
How can the parse error be in only one record, but not in all the others? And if it would be a parse error, how does it appear in 4 different PDF of the same entity?

[shalmaxb]

elevated error log, this is the result, but I do not know to interpret:

[2024-10-09 11:05:54] ALERT: (0) Header values must be RFC 7230 compatible strings. :: GET / :: /var/www/vhosts/___ xxxxx ___/vendor/slim/psr7/src/Headers.php(294)
[object] (InvalidArgumentException(code: 0): Header values must be RFC 7230 compatible strings. at /var/www/vhosts/___ xxxxx ___/vendor/slim/psr7/src/Headers.php:294)
[stacktrace]
#0 /var/www/vhosts/___ xxxxx ___/vendor/slim/psr7/src/Headers.php(259): Slim\Psr7\Headers->validateHeaderValue()
#1 /var/www/vhosts/___ xxxxx ___/vendor/slim/psr7/src/Headers.php(226): Slim\Psr7\Headers->validateHeader()
#2 /var/www/vhosts/___ xxxxx ___/vendor/slim/psr7/src/Headers.php(100): Slim\Psr7\Headers->prepareHeader()
#3 /var/www/vhosts/___ xxxxx ___/vendor/slim/psr7/src/Message.php(125): Slim\Psr7\Headers->setHeader()
#4 /var/www/vhosts/___ xxxxx ___/application/Espo/Core/Api/ResponseWrapper.php(67): Slim\Psr7\Message->withHeader()
#5 /var/www/vhosts/___ xxxxx ___/application/Espo/EntryPoints/Pdf.php(87): Espo\Core\Api\ResponseWrapper->setHeader()
#6 /var/www/vhosts/___ xxxxx ___/application/Espo/Core/EntryPoint/EntryPointManager.php(87): Espo\EntryPoints\Pdf->run()
#7 /var/www/vhosts/___ xxxxx ___/application/Espo/Core/EntryPoint/Starter.php(184): Espo\Core\EntryPoint\EntryPointManager->run()
#8 /var/www/vhosts/___ xxxxx ___/application/Espo/Core/EntryPoint/Starter.php(140): Espo\Core\EntryPoint\Starter->processRequestInternal()
#9 /var/www/vhosts/___ xxxxx ___/application/Espo/Core/EntryPoint/Starter.php(122): Espo\Core\EntryPoint\Starter->processRequest()
#10 /var/www/vhosts/___ xxxxx ___/application/Espo/Core/ApplicationRunners/EntryPoint.php(46): Espo\Core\EntryPoint\Starter->start()
#11 /var/www/vhosts/___ xxxxx ___/application/Espo/Core/Application/RunnerRunner.php(79): Espo\Core\ApplicationRunners\EntryPoint->run()
#12 /var/www/vhosts/___ xxxxx ___/application/Espo/Core/Application.php(78): Espo\Core\Application\RunnerRunner->run()
#13 /var/www/vhosts/___ xxxxx ___/public/index.php(39): Espo\Core\Application->run()
#14 {main}
​