update

cooleshow-user/user-admin/src/main/java/com/yonge/cooleshow/admin/controller/SubjectController.java

@@ -65,7 +65,9 @@ public class SubjectController extends BaseController {
 
 		pageInfo.getRows().forEach(row -> {
 
-			row.setParentSubjectName(map.get(row.getParentSubjectId()).getName());
+			if(row.getParentSubjectId() != null && row.getParentSubjectId() > 0) {
+				row.setParentSubjectName(map.get(row.getParentSubjectId()).getName());
+			}
 
 		});