按领域统计

src/main/java/com/zzsn/thinktank/service/impl/ThinktankBasicInfoServiceImpl.java

@@ -875,6 +875,7 @@ public class ThinktankBasicInfoServiceImpl extends ServiceImpl<ThinktankBasicInf
                 break;
             case "tag":
                 mapList = list.stream()
+                        .filter(info -> StringUtils.isNotBlank(info.getTagName())) // 确保info.getTagName()不为null
                         .flatMap(info -> Arrays.stream(info.getTagName().split(","))) // 拆分每个tagName字段
                         .map(String::trim) // 去除多余的空格
                         .collect(Collectors.groupingBy(