update

app/Models/CourseSign.php

@@ -546,8 +546,12 @@ class CourseSign extends SoftDeletesModel
         }
 
         // 地区
-        $suzhouArea = Company::approvedStudents()->where('company_city', '苏州市')->pluck('company_area')->unique();
+        $suzhouArea = Company::approvedStudents()
-        dd($suzhouArea);
+            ->where('company_city', '苏州市')
+            ->whereNotNull('company_area')
+            ->where('company_area', '!=', '')
+            ->pluck('company_area')
+            ->unique();
         $list = [];
         foreach ($suzhouArea as $area) {
             $sourseSignList2 = (clone $courseSignList)->whereHas('user', function ($query) use ($area) {