diff --git a/src/Http/Controllers/Configuration/ScheduleController.php b/src/Http/Controllers/Configuration/ScheduleController.php
index 007c13506..f59d1d736 100644
--- a/src/Http/Controllers/Configuration/ScheduleController.php
+++ b/src/Http/Controllers/Configuration/ScheduleController.php
@@ -51,7 +51,7 @@ public function listSchedule()
             'every minute'         => '* * * * *',
             'every five minutes'   => '*/5 * * * *',
             'every ten minutes'    => '*/10 * * * *',
-            'every thirty minutes' => '0/30 * * * *',
+            'every thirty minutes' => '*/30 * * * *',
 
         ];
 
diff --git a/src/database/migrations/2024_01_22_191028_fix_invalid_schedules.php b/src/database/migrations/2024_01_22_191028_fix_invalid_schedules.php
new file mode 100644
index 000000000..712b5b357
--- /dev/null
+++ b/src/database/migrations/2024_01_22_191028_fix_invalid_schedules.php
@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * This file is part of SeAT
+ *
+ * Copyright (C) 2015 to present Leon Jacobs
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+/**
+ * Class FixIssueEveseatWeb793.
+ */
+class FixInvalidSchedules extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        DB::table('schedules')
+            ->where('expression', '0/30 * * * *')
+            ->update([
+                'expression' => '*/30 * * * *',
+            ]);
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+    }
+}