update

app/Models/CourseSign.php

@@ -59,7 +59,7 @@ class CourseSign extends SoftDeletesModel
 
     public function courseContentCheck()
     {
-        return $this->hasMany(CourseContentCheck::class, 'course_id', 'course_id');
+        return $this->hasOne(CourseContentCheck::class, 'course_id', 'course_id');
     }
 
     public function user()