item.score != null &&

public/react/src/modules/courses/graduation/tasks/Graduationtaskitem.js

@@ -36,7 +36,7 @@ class Graduationtaskitem extends Component{
 									</a>
 									<span className="t_area fl">{item.time}</span>
 									{/* 分数 */}
-									{item.score >= 0 && <span className="score_area fl">{item.score}分</span>}
+									{item.score != null && item.score >= 0 && <span className="score_area fl">{item.score}分</span>}
 
 									{ !item.is_invalid && item.delete && <Tooltip title={ "删除" } >
 										<i className="iconfont icon-shanchu mr5 fr" style={{marginLeft: '6px'}}