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PDF Export fails with unknown reason at anything that isn't simple text #671
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opened 2026-02-04 21:46:15 +03:00 by OVERLORD
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Reference: starred/BookStack#671
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Originally created by @tdkl on GitHub (May 10, 2018).
For Bug Reports
Expected Behavior
Converted PDF files with images, codeblocks as Export to HTML works without issues.
Current Behavior
Anything beyond headings, bodytext and an image or two fails with "Unknown error", or times out. I've tried it with wkhtmltopdf as well and there's same behaviour.
Steps to Reproduce
Exporting a page to PDF.
Here's the source code of an example of a page that results in unknown error with DomPDF and wkhtmltopdf.
https://pastebin.com/B4RYvSSD
@ssddanbrown commented on GitHub (May 12, 2018):
Hi @tdkl,
Thanks for opening this issue and for providing the sample HTML.
During testing I've found DomPDF exports to work okay with your sample but WKHTML exports are indeed failing.
Could you enable debugging on your instance and post the error message shown when this fails? Would be good to know if your error message matches the one I'm seeing.
@ssddanbrown commented on GitHub (May 12, 2018):
May be related to #796
@tdkl commented on GitHub (May 12, 2018):
Hey @ssddanbrown,
using DomPDF indeed does render this PDF, my mistake. Here's the snip of the log with debug enabled, hope I don't cut anything vital:
/var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request)) #68 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(102): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request)) #69 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(151): Illuminate\\Pipeline\\Pipeline->then(Object(Closure)) #70 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(116): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter(Object(Illuminate\\Http\\Request)) #71 /var/www/bookstack/public/index.php(53): Illuminate\\Foundation\\Http\\Kernel->handle(Object(Illuminate\\Http\\Request)) #72 {main} "} [2018-05-12 12:30:03] production.ERROR: The exit status code '1' says something went wrong: stderr: "Loading pages (1/6) [> ] 0% [======> ] 10% [=========================> ] 42% [============================================================] 100% Counting pages (2/6) [============================================================] Object 1 of 1 Resolving links (4/6) [============================================================] Object 1 of 1 Loading headers and footers (5/6) Printing pages (6/6) [> ] Preparing [===================> ] Page 1 of 3 [=======================================> ] Page 2 of 3 [============================================================] Page 3 of 3 Done Exit with code 1 due to network error: ContentNotFoundError " stdout: "" command: /var/www/bookstack/wkhtmltopdf --lowquality --print-media-type '/tmp/knp_snappy5af6de4a055e76.07222461.html' '/tmp/knp_snappy5af6de4a059651.74844259.pdf'. {"userId":3,"email":"tadej<redacted>","exception":"[object] (RuntimeException(code: 0): The exit status code '1' says something went wrong: stderr: \"Loading pages (1/6) [> ] 0% [======> ] 10% [=========================> ] 42% [============================================================] 100% Counting pages (2/6) [============================================================] Object 1 of 1 Resolving links (4/6) [============================================================] Object 1 of 1 Loading headers and footers (5/6) Printing pages (6/6) [> ] Preparing [===================> ] Page 1 of 3 [=======================================> ] Page 2 of 3 [============================================================] Page 3 of 3 Done Exit with code 1 due to network error: ContentNotFoundError \" stdout: \"\" command: /var/www/bookstack/wkhtmltopdf --lowquality --print-media-type '/tmp/knp_snappy5af6de4a055e76.07222461.html' '/tmp/knp_snappy5af6de4a059651.74844259.pdf'. at /var/www/bookstack/vendor/knplabs/knp-snappy/src/Knp/Snappy/AbstractGenerator.php:378) [stacktrace] #0 /var/www/bookstack/vendor/knplabs/knp-snappy/src/Knp/Snappy/AbstractGenerator.php(177): Knp\\Snappy\\AbstractGenerator->checkProcessStatus(1, '', 'Loading pages (...', '/var/www/bookst...') #1 /var/www/bookstack/vendor/knplabs/knp-snappy/src/Knp/Snappy/Pdf.php(63): Knp\\Snappy\\AbstractGenerator->generate(Array, '/tmp/knp_snappy...', Array, false) #2 /var/www/bookstack/vendor/knplabs/knp-snappy/src/Knp/Snappy/AbstractGenerator.php(221): Knp\\Snappy\\Pdf->generate(Array, '/tmp/knp_snappy...', Array) #3 /var/www/bookstack/vendor/knplabs/knp-snappy/src/Knp/Snappy/AbstractGenerator.php(242): Knp\\Snappy\\AbstractGenerator->getOutput(Array, Array) #4 /var/www/bookstack/vendor/barryvdh/laravel-snappy/src/PdfWrapper.php(176): Knp\\Snappy\\AbstractGenerator->getOutputFromHtml('<!doctype html>...', Array) #5 /var/www/bookstack/app/Services/ExportService.php(141): Barryvdh\\Snappy\\PdfWrapper->output() #6 /var/www/bookstack/app/Services/ExportService.php(87): BookStack\\Services\\ExportService->htmlToPdf('<!doctype html>...') #7 /var/www/bookstack/app/Http/Controllers/PageController.php(458): BookStack\\Services\\ExportService->pageToPdf(Object(BookStack\\Page)) #8 [internal function]: BookStack\\Http\\Controllers\\PageController->exportPdf('cestni-in\\xC5\\xBEenir...', 'konfiguracija-i...') #9 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(54): call_user_func_array(Array, Array) #10 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(45): Illuminate\\Routing\\Controller->callAction('exportPdf', Array) #11 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Route.php(212): Illuminate\\Routing\\ControllerDispatcher->dispatch(Object(Illuminate\\Routing\\Route), Object(BookStack\\Http\\Controllers\\PageController), 'exportPdf') #12 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Route.php(169): Illuminate\\Routing\\Route->runController() #13 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Router.php(658): Illuminate\\Routing\\Route->run() #14 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(30): Illuminate\\Routing\\Router->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request)) #15 /var/www/bookstack/app/Http/Controllers/Controller.php(44): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request)) #16 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(131): BookStack\\Http\\Controllers\\Controller->BookStack\\Http\\Controllers\\{closure}(Object(Illuminate\\Http\\Request), Object(Closure)) #17 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request)) #18 /var/www/bookstack/app/Http/Middleware/Authenticate.php(48): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request)) #19 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): BookStack\\Http\\Middleware\\Authenticate->handle(Object(Illuminate\\Http\\Request), Object(Closure)) #20 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request)) #21 /var/www/bookstack/app/Http/Middleware/Localization.php(33): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request)) #22 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(149): BookStack\\Http\\Middleware\\Localization->handle(Object(Illuminate\\Http\\Request), Object(Closure)) #23 /var/www/bookstack/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request)) #24Couple questions:
does attaching large images in a Bookstack page influence the success of an PDF export (using both PDF export engines)? I usually don't resize screenshots and they're properly resized when viewing on the web, also when exporting the HTML,
does the server instance hardware affects export? I use a small VM, 1 core, 512MB RAM (only 2 users on the Bookstack instance, rarely at the same time).
@tdkl commented on GitHub (May 12, 2018):
My mistake closing the issue 😇
@rockenren commented on GitHub (May 14, 2018):
I have same issue: https://pastebin.com/5B7tTTwF
Some PDF renders ok, some not.
Temporary solution from #796 not worked for me.
@tdkl commented on GitHub (Jun 5, 2018):
Hello,
release v22 with the commit from #796 fixed rendering the above example, thanks !