diff --git a/src/Controller/APIController.php b/src/Controller/APIController.php
index 31bbc15b..0bdd2c5c 100644
--- a/src/Controller/APIController.php
+++ b/src/Controller/APIController.php
@@ -3079,7 +3079,7 @@ class APIController extends Controller implements LoggedController
             if ($mins > 10)
             {
                 $next_slot_id = sprintf('%02d_$02d', $hour + 1, $hour + 2);
-                error_log("NEXT SLOT - $date_string - $slot_id");
+                error_log("NEXT SLOT - $date_string - $next_slot_id");
 				// decrement rider slot
 				if (isset($hub_rider_slots[$date_string][$next_slot_id]))
 					$hub_rider_slots[$date_string][$next_slot_id]--;