Created attachment 192770 [details] Example file from Writer Attached example file contains two content controls (the bug does not happen with only one). When this is exported as tagged PDF with the Create PDF Form option enabled, PAC tools PDF/UA check will fail with the message "Stack empty". 1. Open attached file (or attachment 186881 [details] from bug 154984 to test with every supported content controls) 2. Export as PDF, with the Tagged PDF and Create PDF forms options enabled. 3. Open the resulting PDF (or attachment 186882 [details] from bug 154984 ) in the PAC 2021 tool -> "Stack empty" exception box appears early in the checking, indicating there is some internal inconsistency in the exported PDF. If the PDF/UA option is also enabled, or the Create PDF form option is not enabled, this error does not happen. Version: 24.8.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: 8eee7eab8087590aa19bb9989c294e9be767f356 CPU threads: 15; OS: Windows 10.0 Build 19045; UI render: default; VCL: win Locale: hu-HU (hu_HU); UI: en-US Calc: default Seems to have started in 7.5 with: https://git.libreoffice.org/core/+/6b2433f3b66c1f118dabcd40924122deb2d4f204 author Miklos Vajna <vmiklos@collabora.com> Wed Sep 14 08:35:28 2022 +0200 committer Miklos Vajna <vmiklos@collabora.com> Wed Sep 14 10:08:04 2022 +0200 sw content controls, dropdown: add PDF export
Created attachment 192771 [details] The example file exported as PDF from current master
Created attachment 192772 [details] Screenshot of the example document and the PAC error message
reproduced with PDF exported with: Version: 24.2.1.2 (X86_64) / LibreOffice Community Build ID: db4def46b0453cc22e2d0305797cf981b68ef5ac CPU threads: 4; OS: Windows 10.0 Build 22631; UI render: Skia/Raster; VCL: win Locale: en-US (en_US); UI: en-US Calc: threaded and analysed with PAC 21.0.0.0.
Tibor Nagy committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/54374c97b86730d97f5ad622dc88c0798af4be1c tdf#159895 sw: fix "Stack empty" error in tagged PDF export It will be available in 25.2.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.