I encountered an error when i try to close test session
With admin account, on multiple testsession

Here reported error on log file
2019-09-23 17:18:50.551 ** ERROR ** [V8.1.6] HACK ================================================================
2019-09-23 17:18:50.551 ** ERROR ** [V8.1.6] Try to hack detected
2019-09-23 17:18:50.551 ** ERROR ** [V8.1.6] Source Code = Invalid dateTime format for 'Mon Sep 23 2019 17:18:50 GMT+0200 (heure d’été d’Europe centrale)' : only 5 to 19 characters length possible
2019-09-23 17:18:50.551 ** ERROR ** [V8.1.6] QUERY_STRING = destinationWidth=48&destinationHeight=0&isIE=&xhrPostDestination=resultDiv&xhrPostIsResultMessage=true&xhrPostValidationType=&xhrPostTimestamp=1569251930252
2019-09-23 17:18:50.551 ** ERROR ** [V8.1.6] REMOTE_ADDR = 192.168.1.110
2019-09-23 17:18:50.551 ** ERROR ** [V8.1.6] SCRIPT_FILENAME = /var/www/html/projeqtor/tool/saveObject.php
2019-09-23 17:18:50.551 ----- DEBUG ----- => /var/www/html/projeqtor/tool/projeqtor.php at line 1514 calling debugPrintTraceStack()
2019-09-23 17:18:50.551 ----- DEBUG ----- => /var/www/html/projeqtor/model/Security.php at line 102 calling traceHack()
2019-09-23 17:18:50.551 ----- DEBUG ----- => /var/www/html/projeqtor/model/persistence/SqlElement.php at line 2874 calling Security:checkValidDateTime()
2019-09-23 17:18:50.551 ----- DEBUG ----- => /var/www/html/projeqtor/model/persistence/SqlElement.php at line 2400 calling SqlElement:fillSqlElementFromRequest()
2019-09-23 17:18:50.551 ----- DEBUG ----- => /var/www/html/projeqtor/tool/saveObject.php at line 69 calling SqlElement:fillFromRequest()
2019-09-23 17:18:50.552 ** ERROR ** [V8.1.6] REQUEST_URI = /tool/saveObject.php?destinationWidth=48&destinationHeight=0&isIE=&xhrPostDestination=resultDiv&xhrPostIsResultMessage=true&xhrPostValidationType=&xhrPostTimestamp=1569251930252

I try upgrade to 8.2.1, error is persistant
2019-09-23 17:37:19.776 ** ERROR ** [V8.2.1] HACK ================================================================
2019-09-23 17:37:19.776 ** ERROR ** [V8.2.1] Try to hack detected
2019-09-23 17:37:19.776 ** ERROR ** [V8.2.1] Source Code = Invalid dateTime format for 'Mon Sep 23 2019 17:37:19 GMT+0200 (heure d’été d’Europe centrale)' : only 5 to 19 characters length possible
2019-09-23 17:37:19.776 ** ERROR ** [V8.2.1] QUERY_STRING = destinationWidth=48&destinationHeight=0&isIE=&xhrPostDestination=resultDiv&xhrPostIsResultMessage=true&xhrPostValidationType=&xhrPostTimestamp=1569253039445
2019-09-23 17:37:19.776 ** ERROR ** [V8.2.1] REMOTE_ADDR = 192.168.1.110
2019-09-23 17:37:19.776 ** ERROR ** [V8.2.1] SCRIPT_FILENAME = /var/www/html/projeqtor/tool/saveObject.php
2019-09-23 17:37:19.776 ----- DEBUG ----- => /var/www/html/projeqtor/tool/projeqtor.php at line 1517 calling debugPrintTraceStack()
2019-09-23 17:37:19.776 ----- DEBUG ----- => /var/www/html/projeqtor/model/Security.php at line 102 calling traceHack()
2019-09-23 17:37:19.776 ----- DEBUG ----- => /var/www/html/projeqtor/model/persistence/SqlElement.php at line 2882 calling Security:checkValidDateTime()
2019-09-23 17:37:19.776 ----- DEBUG ----- => /var/www/html/projeqtor/model/persistence/SqlElement.php at line 2408 calling SqlElement:fillSqlElementFromRequest()
2019-09-23 17:37:19.776 ----- DEBUG ----- => /var/www/html/projeqtor/tool/saveObject.php at line 69 calling SqlElement:fillFromRequest()
2019-09-23 17:37:19.776 ** ERROR ** [V8.2.1] REQUEST_URI = /tool/saveObject.php?destinationWidth=48&destinationHeight=0&isIE=&xhrPostDestination=resultDiv&xhrPostIsResultMessage=true&xhrPostValidationType=&xhrPostTimestamp=1569253039445

Just after i'm disconnected

Thanks for your help