update

src/views/course_details/index.vue

@@ -9,7 +9,9 @@
         <div class="text">
           <p class="p1">{{ CourseData.name }}</p>
           <p>Beijing language and Culture University</p>
-          <p>{{ CourseData.teacher_list[0].teacher_name }}</p>
+          <p>
+            {{ CourseData.teacher_list.length > 0 ? CourseData.teacher_list[0].teacher_name : '' }}
+          </p>
           <p>
             <!-- Learn to design data models, build data warehouses and data lakes,
             automate data pipelines, and work with massive datasets. At the end