Impossible d'ajouter un tag à un logiciel

Erreur: Quelque chose s'est mal passé de notre côté, on y travaille :)

Contenu du error.log:

2018-08-14 16:17:26 Error: [PDOException] SQLSTATE[23502] Not null violation: 7 ERROR:  null value in column "id" violates not-null constraint 
DETAIL:  Failing row contains (null, 162, 11). 
Request URL: /softwares/edit/162 
Referer URL: https://www.comptoir-du-libre.org/softwares/edit/162 
Client IP: 109.190.216.28 
Stack Trace: 
#0 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/Database/Statement/StatementDecorator.php(172): PDOStatement->execute(NULL) 
#1 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/Database/Connection.php(276): Cake\Database\Statement\StatementDecorator->execute() 
#2 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/Database/Query.php(190): Cake\Database\Connection->run(Object(Cake\ORM\Query)) 
#3 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Table.php(1669): Cake\Database\Query->execute() 
#4 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Table.php(1563): Cake\ORM\Table->_insert(Object(App\Model\Entity\SoftwaresTag), Array) 
#5 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Table.php(1491): Cake\ORM\Table->_processSave(Object(App\Model\Entity\SoftwaresTag), Object(ArrayObject)) 
#6 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/Database/Connection.php(570): Cake\ORM\Table->Cake\ORM\{closure}(Object(Cake\Database\Connection)) 
#7 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Table.php(1492): Cake\Database\Connection->transactional(Object(Closure)) 
#8 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Association/BelongsToMany.php(701): Cake\ORM\Table->save(Object(App\Model\Entity\SoftwaresTag), Object(ArrayObject)) 
#9 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Association/BelongsToMany.php(650): Cake\ORM\Association\BelongsToMany->_saveLinks(Object(App\Model\Entity\Software), Array, Array) 
#10 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Association/BelongsToMany.php(1052): Cake\ORM\Association\BelongsToMany->_saveTarget(Object(App\Model\Entity\Software), Array, Array) 
#11 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/Database/Connection.php(570): Cake\ORM\Association\BelongsToMany->Cake\ORM\Association\{closure}(Object(Cake\Database\Connection)) 
#12 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Association/BelongsToMany.php(1071): Cake\Database\Connection->transactional(Object(Closure)) 
#13 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Association/BelongsToMany.php(584): Cake\ORM\Association\BelongsToMany->replaceLinks(Object(App\Model\Entity\Software), Array, Array) 
#14 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/AssociationCollection.php(260): Cake\ORM\Association\BelongsToMany->saveAssociated(Object(App\Model\Entity\Software), Array) 
#15 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/AssociationCollection.php(234): Cake\ORM\AssociationCollection->_save(Object(Cake\ORM\Association\BelongsToMany), Object(App\Model\Entity\Software), Array, Array) 
#16 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/AssociationCollection.php(199): Cake\ORM\AssociationCollection->_saveAssociations(Object(App\Model\Table\SoftwaresTable), Object(App\Model\Entity\Software), Array, Array, true) 
#17 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Table.php(1596): Cake\ORM\AssociationCollection->saveChildren(Object(App\Model\Table\SoftwaresTable), Object(App\Model\Entity\Software), Array, Array) 
#18 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Table.php(1569): Cake\ORM\Table->_onSaveSuccess(Object(App\Model\Entity\Software), Object(ArrayObject)) 
#19 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Table.php(1491): Cake\ORM\Table->_processSave(Object(App\Model\Entity\Software), Object(ArrayObject)) 
#20 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/Database/Connection.php(570): Cake\ORM\Table->Cake\ORM\{closure}(Object(Cake\Database\Connection)) 
#21 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/ORM/Table.php(1492): Cake\Database\Connection->transactional(Object(Closure)) 
#22 /home/comptoir/Comptoir-srv/src/Controller/Api/V1/SoftwaresController.php(354): Cake\ORM\Table->save(Object(App\Model\Entity\Software)) 
#23 [internal function]: App\Controller\Api\V1\SoftwaresController->edit('162') 
#24 /home/comptoir/Comptoir-srv/vendor/friendsofcake/crud/src/Controller/ControllerTrait.php(51): call_user_func_array(Array, Array) 
#25 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/Http/ActionDispatcher.php(121): App\Controller\AppController->invokeAction() 
#26 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/Http/ActionDispatcher.php(95): Cake\Http\ActionDispatcher->_invoke(Object(App\Controller\Api\V1\SoftwaresController)) 
#27 /home/comptoir/Comptoir-srv/vendor/cakephp/cakephp/src/Routing/Dispatcher.php(60): Cake\Http\ActionDispatcher->dispatch(Object(Cake\Network\Request), Object(Cake\Network\Response)) 
#28 /home/comptoir/Comptoir-srv/webroot/index.php(36): Cake\Routing\Dispatcher->dispatch(Object(Cake\Network\Request), Object(Cake\Network\Response)) 
#29 {main} 

Pour le moment, je n'arrive pas à reproduire le bug en Docker-local :(

Visible en v2.4.8 (en prod au 16/08/18)