diff --git a/apps/common/field/common.py b/apps/common/field/common.py
index a97469891ce..3d6c95f1177 100644
--- a/apps/common/field/common.py
+++ b/apps/common/field/common.py
@@ -27,7 +27,7 @@ class FunctionField(serializers.Field):
 
     def to_internal_value(self, data):
         if not callable(data):
-            self.fail('不是一個函數', value=data)
+            self.fail('不是一个函數', value=data)
         return data
 
     def to_representation(self, value):
diff --git a/ui/src/views/problem/component/RelateProblemDialog.vue b/ui/src/views/problem/component/RelateProblemDialog.vue
index 36fc47d6259..0ac461bbb2d 100644
--- a/ui/src/views/problem/component/RelateProblemDialog.vue
+++ b/ui/src/views/problem/component/RelateProblemDialog.vue
@@ -172,7 +172,7 @@ function getDocument() {
     cloneDocumentList.value = res.data
     documentList.value = res.data
     currentDocument.value = cloneDocumentList.value?.length > 0 ? cloneDocumentList.value[0].id : ''
-    getParagraphList(currentDocument.value)
+    currentDocument.value && getParagraphList(currentDocument.value)
   })
 }