diff --git a/classes/migration/upgrade/v3_4_0/I7249_UpdateUsersUniqueIndex_v3_1.php b/classes/migration/upgrade/v3_4_0/I7249_UpdateUsersUniqueIndex_v3_1.php
index 4a2d3fa5c9e..025d8a49c6f 100644
--- a/classes/migration/upgrade/v3_4_0/I7249_UpdateUsersUniqueIndex_v3_1.php
+++ b/classes/migration/upgrade/v3_4_0/I7249_UpdateUsersUniqueIndex_v3_1.php
@@ -23,8 +23,8 @@ public function up(): void
     {
         switch (DB::getDriverName()) {
             case 'pgsql':
-                DB::unprepared('DROP INDEX users_username;');
-                DB::unprepared('DROP INDEX users_email;');
+                DB::unprepared('DROP INDEX IF EXISTS users_username;');
+                DB::unprepared('DROP INDEX IF EXISTS users_email;');
 
                 DB::unprepared('CREATE UNIQUE INDEX users_username on users (LOWER(username));');
                 DB::unprepared('CREATE UNIQUE INDEX users_email on users (LOWER(email));');
@@ -36,8 +36,8 @@ public function down(): void
     {
         switch (DB::getDriverName()) {
             case 'pgsql':
-                DB::unprepared('DROP INDEX users_username;');
-                DB::unprepared('DROP INDEX users_email;');
+                DB::unprepared('DROP INDEX IF EXISTS users_username;');
+                DB::unprepared('DROP INDEX IF EXISTS users_email;');
 
                 DB::unprepared('CREATE UNIQUE INDEX users_username on users (username);');
                 DB::unprepared('CREATE UNIQUE INDEX users_email on users (email);');