Not planned DBTech\Shop\Service\Item\DeleteCleanUp::stepDeletePurchases() server error (XF 2.2)

[webwide]

Re-occuring server error after deleting product in XF 2.2 (DragonByte Shop 6.4.0 Beta 2)

TypeError: Argument 1 passed to DBTech\Shop\Service\Item\DeleteCleanUp::stepDeletePurchases() must be of the type int, null given, called in /home/webwide/public_html/src/XF/MultiPartRunnerTrait.php on line 48 src/addons/DBTech/Shop/Service/Item/DeleteCleanUp.php:72

#0 src/XF/MultiPartRunnerTrait.php(48): DBTech\Shop\Service\Item\DeleteCleanUp->stepDeletePurchases(NULL, G)
#1 src/addons/DBTech/Shop/Service/Item/DeleteCleanUp.php(57): DBTech\Shop\Service\Item\DeleteCleanUp->runLoop(7)
#2 src/addons/DBTech/Shop/Job/ItemDeleteCleanUp.php(49): DBTech\Shop\Service\Item\DeleteCleanUp->cleanUp(7)
#3 src/XF/Job/Manager.php(258): DBTech\Shop\Job\ItemDeleteCleanUp->run(G)
#4 src/XF/Job/Manager.php(200): XF\Job\Manager->runJobInternal(Array, G)
#5 src/XF/Job/Manager.php(84): XF\Job\Manager->runJobEntry(Array, G)
#6 job.php(43): XF\Job\Manager->runQueue(false, 8)
#7 {main}

array(4) {
["url"] => string(8) "/job.php"
["referrer"] => string(19) "xx"
["_GET"] => array(0) {
}
["_POST"] => array(0) {
}
}