diff --git a/application/Espo/Hooks/Common/NextNumber.php b/application/Espo/Hooks/Common/NextNumber.php
index e509a79154..c9e48e5ceb 100644
--- a/application/Espo/Hooks/Common/NextNumber.php
+++ b/application/Espo/Hooks/Common/NextNumber.php
@@ -75,7 +75,10 @@ class NextNumber extends \Espo\Core\Hooks\Base
                     'fieldName' => $fieldName,
                     'entityType' => $entity->getEntityType()
                 ))->findOne();
-                if (!$nextNumber) continue;
+                if (!$nextNumber) {
+                    $this->getEntityManager()->getPdo()->query('UNLOCK TABLES');
+                    continue;
+                }
                 $entity->set($fieldName, $this->composeNumberAttribute($nextNumber));
 
                 $value = $nextNumber->get('value');