Error with disconnect on save - by: pipobru

Hello,
When i use planning by resource, if i would save a little modification (priority of task) on a task, i have a disconnect message and this trace in log:

2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] Exception-[22P02] SQLSTATE[22P02]: Invalid text representation: 7 ERROR: invalid input syntax for type numeric: "false"
LINE 1: ... cpt from assignment where assignment.idResource= 'false' an...
^
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] For query : select count(*) as cpt from assignment where assignment.idResource= 'false' and assignment.refType= 'Activity' and assignment.refId= '1076'
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] Strack trace :
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] #0 Sql->query called at [/var/www/html/model/persistence/SqlElement.php:2630]
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] #1 SqlElement->countSqlElementsFromCriteria called at [/var/www/html/model/ActivityMain.php:596]
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] #2 ActivityMain->save called at [/var/www/html/tool/saveObject.php:80]
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] HACK ================================================================
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] Try to hack detected
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] Source Code = SqlElement->_construct : id 'false' is not numeric for class ResourceAll
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] QUERY_STRING = selectedResource=false&destinationWidth=50&destinationHeight=0&isIE=11&xhrPostDestination=resultDivMain&xhrPostIsResultMessage=true&xhrPostValidationType=&xhrPostTimestamp=1586441591992
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] REMOTE_ADDR = 10.117.1.200
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] SCRIPT_FILENAME = /var/www/html/tool/saveObject.php
2020-04-09 16:16:13.871

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DEBUG

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=> /var/www/html/tool/projeqtor.php at line 1524 calling debugPrintTraceStack()
2020-04-09 16:16:13.871

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DEBUG

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=> /var/www/html/model/persistence/SqlElement.php at line 685 calling traceHack()
2020-04-09 16:16:13.871

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DEBUG

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=> /var/www/html/model/ResourceMain.php at line 148 calling SqlElement:__construct()
2020-04-09 16:16:13.871

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DEBUG

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=> /var/www/html/model/Resource.php at line 39 calling ResourceMain:__construct()
2020-04-09 16:16:13.871

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DEBUG

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=> /var/www/html/model/ResourceAll.php at line 41 calling Resource:__construct()
2020-04-09 16:16:13.871

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DEBUG

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=> /var/www/html/model/Assignment.php at line 150 calling ResourceAll:__construct()
2020-04-09 16:16:13.871

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DEBUG

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=> /var/www/html/model/ActivityMain.php at line 612 calling Assignment:save()
2020-04-09 16:16:13.871

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DEBUG

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=> /var/www/html/tool/saveObject.php at line 80 calling ActivityMain:save()
2020-04-09 16:16:13.871 ***** ERROR ***** [V8.4.2] REQUEST_URI = /tool/saveObject.php?selectedResource=false&destinationWidth=50&destinationHeight=0&isIE=11&xhrPostDestination=resultDivMain&xhrPostIsResultMessage=true&xhrPostValidationType=&xhrPostTimestamp=1586441591992
2020-04-09 16:19:09.572

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DEBUG

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loginCheck : current db version = 'V8.4.2'
Thanks !