Export to pdf format failure

Hello !

I experienced issues for pdf export at two places, with two different logged errors:
- Meetings export :
2020-04-15 17:03:07.651 ***** ERROR ***** [V8.4.3] EXCEPTION *****
2020-04-15 17:03:07.651 ***** ERROR ***** [V8.4.3] on file '/var/www/html/projeqtor/external/html2pdf/src/Parsing/Html.php' at line (262)
2020-04-15 17:03:07.651 ***** ERROR ***** [V8.4.3] cause = Tags are closed in a wrong order for 2020-04-15 17:03:07.651 ***** ERROR ***** [V8.4.3] => #0 /var/www/html/projeqtor/external/html2pdf/src/Parsing/Html.php (94) -> getTagAction()
2020-04-15 17:03:07.651 ***** ERROR ***** [V8.4.3] => #1 /var/www/html/projeqtor/external/html2pdf/src/Html2Pdf.php (610) -> parse()
2020-04-15 17:03:07.651 ***** ERROR ***** [V8.4.3] => #2 /var/www/html/projeqtor/view/print.php (309) -> writeHTML()
2020-04-15 17:03:07.652 ***** ERROR ***** [V8.4.3] => #3 /var/www/html/projeqtor/view/print.php (252) -> finalizePrint()

- Risk export :
2020-04-15 17:12:12.875 ***** ERROR ***** [V8.4.3] ERROR *****
2020-04-15 17:12:12.875 ***** ERROR ***** [V8.4.3] on file '/var/www/html/projeqtor/external/html2pdf/src/Html2Pdf.php' at line (5283)
2020-04-15 17:12:12.875 ***** ERROR ***** [V8.4.3] cause = Undefined offset: 1

Hi,

Thanks again for your support.
In fact, I can't reproduce the risk issue in the demo project.
Nevertheless, this issue still occurs in my local project (v8.4.3).
Versions hereafter :

ProjeQtOr V8.4.3 (258)

Website : www.projeqtor.org


Version of external libraries :
. Dojo : 1.16.2
. html2pdf : 5.2.2
. CK Editor : 4.11.2
. pChart2 : 2.1.4
. phpMailer : 6.0.6
. html2canvas : 1.0.0-alpha.12
. pdfMake : 0.1.39
CryptoJS 3.1.2
phpAES
TinyButStrong 3.10.1
XLSReader

No modification on this file (the custom file does not exist)