fix

public/react/src/modules/courses/shixunHomework/ShixunhomeWorkItem.js

@@ -359,7 +359,7 @@ class ShixunhomeWorkItem extends Component{
                 }
                 {
                   discussMessage && discussMessage.upper_category_name &&
-                  <ConditionToolTip title={discussMessage.upper_category_name} condition={ discussMessage.upper_category_name.title.length > 22 }>
+                  <ConditionToolTip title={discussMessage.upper_category_name} condition={ discussMessage.upper_category_name.length > 22 }>
                     { <span className="mr15 color-grey9 task-hide" style={{"maxWidth":"272px"}}>{discussMessage.upper_category_name}</span>}
                   </ConditionToolTip>
                 }