Fix PHP fatal error on an undefined constant in contacts import action (#8277)

CHANGELOG.md

@@ -18,6 +18,7 @@
 - Fix charset conversion errors on PHP < 8 for charsets not supported by mbstring (#8252)
 - Fix bug where adding a contact to trusted senders via "Always allow from..." button didn't work (#8264, #8268)
 - Fix bug with show_images setting where option 1 and 3 were swapped (#8268)
+- Fix PHP fatal error on an undefined constant in contacts import action (#8277)
 
 ## Release 1.5.0
 

program/actions/contacts/import.php

@@ -256,7 +256,7 @@ class rcmail_action_contacts_import extends rcmail_action_contacts_index
                 $rcmail->output->command('parent.import_state_set', self::$stats->inserted ? 'reload' : 'ok');
             }
             else {
-                if ($upload_error == UPLOAD_ERR_CSV_FIELDS) {
+                if ($upload_error == self::UPLOAD_ERR_CSV_FIELDS) {
                     $rcmail->output->show_message('csvfilemismatch', 'error');
                 }
                 else {