diff --git a/public/include/config/error_codes.inc.php b/public/include/config/error_codes.inc.php
index 518bed00..ea1c8fd3 100644
--- a/public/include/config/error_codes.inc.php
+++ b/public/include/config/error_codes.inc.php
@@ -67,4 +67,5 @@ $aErrorCodes['E0060'] = 'Failed to add new worker';
 $aErrorCodes['E0061'] = 'Failed to delete worker';
 $aErrorCodes['E0062'] = 'Block has no share_id, not running payouts';
 $aErrorCodes['E0063'] = 'Upstream share already assigned to previous block';
+$aErrorCodes['E0064'] = 'Unable to fetch worker ID';
 ?>