diff --git a/zmsdb/src/Zmsdb/Connection/Select.php b/zmsdb/src/Zmsdb/Connection/Select.php
index 35d931e4f..a494b5397 100644
--- a/zmsdb/src/Zmsdb/Connection/Select.php
+++ b/zmsdb/src/Zmsdb/Connection/Select.php
@@ -323,4 +323,9 @@ public static function writeCommit()
         }
         return null;
     }
+
+    public static function writeCommitWithStartLock()
+    {
+        return self::writeCommit() && (new \BO\Zmsdb\Config)->readProperty('status__calculateSlotsLastRun', true);
+    }
 }
diff --git a/zmsdb/src/Zmsdb/Helper/CalculateSlots.php b/zmsdb/src/Zmsdb/Helper/CalculateSlots.php
index 097b5ab5b..ca2a095d1 100644
--- a/zmsdb/src/Zmsdb/Helper/CalculateSlots.php
+++ b/zmsdb/src/Zmsdb/Helper/CalculateSlots.php
@@ -144,7 +144,7 @@ protected function writeCalculatedScope(\BO\Zmsentities\Scope $scope, \DateTimeI
         }
         if (count($updatedList)) {
             $this->writePostProcessingByScope($scope, $now);
-            \BO\Zmsdb\Connection\Select::writeCommit();
+            \BO\Zmsdb\Connection\Select::writeCommitWithStartLock();
             $this->readLastRun();
             return true;
         }