problem with Cron

I've got problem with CRON on V8.1.0:

2019-06-21 14:51:31.618 ===== TRACE ===== Cron started at 21/06/2019 14:51:31
2019-06-21 14:51:34.404 ***** ERROR ***** [V8.1.0] EXCEPTION *****
2019-06-21 14:51:34.404 ***** ERROR ***** [V8.1.0] on file '/var/www/projeqtor/external/html2pdf/src/Html2Pdf.php' at line (5668)
2019-06-21 14:51:34.404 ***** ERROR ***** [V8.1.0] cause = The content of the TD tag does not fit on only one page
2019-06-21 14:51:34.404 ***** ERROR ***** [V8.1.0] => #0 /var/www/projeqtor/external/html2pdf/src/Html2Pdf.php (1439) -> _tag_close_TD()
2019-06-21 14:51:34.404 ***** ERROR ***** [V8.1.0] => #1 /var/www/projeqtor/external/html2pdf/src/Html2Pdf.php (1393) -> _executeAction()
2019-06-21 14:51:34.404 ***** ERROR ***** [V8.1.0] => #2 /var/www/projeqtor/external/html2pdf/src/Html2Pdf.php (595) -> _makeHTMLcode()
2019-06-21 14:51:34.404 ***** ERROR ***** [V8.1.0] => #3 /var/www/projeqtor/model/AutoSendReport.php (218) -> writeHTML()
2019-06-21 14:51:34.404 ***** ERROR ***** [V8.1.0] => #4 /var/www/projeqtor/model/Cron.php (475) -> sendReport()
2019-06-21 14:51:34.404 ***** ERROR ***** [V8.1.0] => #5 /var/www/projeqtor/tool/cronRun.php (31) -> run()
2019-06-21 14:51:34.404 ===== TRACE ===== Exception while executing script : try and restart

so, do you know what i need to do to repare it ?

I'm just connect this morning, without other user, and do not try to display something, just connect, and show the log file.
this is write on log file:
2019-06-25 07:29:54.774 ===== TRACE ===== NEW CONNECTED USER 'admin'
2019-06-25 07:29:55.526 ===== TRACE ===== current version V8.1.0 is higher than latest released V8.0.6
2019-06-25 07:30:00.271 ===== TRACE ===== Cron started at 25/06/2019 07:30:00
2019-06-25 07:30:02.256 ===== TRACE ===== BackupDatabase has been done by the Cron
2019-06-25 07:30:05.589 ***** ERROR ***** [V8.1.0] EXCEPTION *****
2019-06-25 07:30:05.589 ***** ERROR ***** [V8.1.0] on file '/var/www/projeqtor/external/html2pdf/src/Html2Pdf.php' at line (5668)
2019-06-25 07:30:05.589 ***** ERROR ***** [V8.1.0] cause = The content of the TD tag does not fit on only one page
2019-06-25 07:30:05.589 ***** ERROR ***** [V8.1.0] => #0 /var/www/projeqtor/external/html2pdf/src/Html2Pdf.php (1439) -> _tag_close_TD()
2019-06-25 07:30:05.589 ***** ERROR ***** [V8.1.0] => #1 /var/www/projeqtor/external/html2pdf/src/Html2Pdf.php (1393) -> _executeAction()
2019-06-25 07:30:05.589 ***** ERROR ***** [V8.1.0] => #2 /var/www/projeqtor/external/html2pdf/src/Html2Pdf.php (595) -> _makeHTMLcode()
2019-06-25 07:30:05.589 ***** ERROR ***** [V8.1.0] => #3 /var/www/projeqtor/model/AutoSendReport.php (218) -> writeHTML()
2019-06-25 07:30:05.589 ***** ERROR ***** [V8.1.0] => #4 /var/www/projeqtor/model/Cron.php (475) -> sendReport()
2019-06-25 07:30:05.589 ***** ERROR ***** [V8.1.0] => #5 /var/www/projeqtor/model/Cron.php (337) -> run()
2019-06-25 07:30:05.589 ***** ERROR ***** [V8.1.0] => #6 /var/www/projeqtor/tool/cronRelaunch.php (30) -> relaunch()
2019-06-25 07:30:05.589 ===== TRACE ===== Exception while executing script : try and restart