diff --git a/migrations/2024_11_12_073145_add_json_type_to_custom_field_plain_types_table.php b/migrations/2024_11_12_073145_add_json_type_to_custom_field_plain_types_table.php
index 770c3e2..58bd2c8 100644
--- a/migrations/2024_11_12_073145_add_json_type_to_custom_field_plain_types_table.php
+++ b/migrations/2024_11_12_073145_add_json_type_to_custom_field_plain_types_table.php
@@ -13,6 +13,13 @@
      */
     public function up()
     {
+
+        $exists = DB::table('custom_field_plain_types')->where('name', 'json')->exists();
+        if ($exists) {
+            // already exists
+            return;
+        }
+
         $types = ['json'];
 
         $plainTypes = [];