diff --git a/app/Models/CourseSign.php b/app/Models/CourseSign.php
index f1efdae..fb117f9 100755
--- a/app/Models/CourseSign.php
+++ b/app/Models/CourseSign.php
@@ -128,7 +128,7 @@ class CourseSign extends SoftDeletesModel
                 }
             })->whereNotIn('status', [4, 5])
             ->get();
-        $userIds = $courseSignByType->pluck('user_id')->toArray();
+        $userIds = $courseSignByType->implode('user_id', ',');
         return User::whereIn('id', $courseSignByType->pluck('user_id'))->distinct('mobile')->count();
     }