购物车为空时报错

src/main/java/com/aida/seller/common/exception/GlobalExceptionHandler.java

@@ -54,7 +54,7 @@ public class GlobalExceptionHandler {
     @ExceptionHandler(Exception.class)
     public Response<?> handleException(Exception e) {
         log.error("系统异常: ", e);
-        return Response.error("系统繁忙，请稍后再试");
+        return Response.error(e.getMessage());
     }
     /**
      * 处理MinIO异常

src/main/java/com/aida/seller/module/listing/service/impl/ListingMallServiceImpl.java

@@ -248,7 +248,11 @@ public class ListingMallServiceImpl extends ServiceImpl<ListingMallMapper, Listi
                 .distinct()
                 .toList();
 
-        Map<Long, DesignerEntity> designerMap = designerMapper.selectList(
+        Map<Long, DesignerEntity> designerMap;
+        if (CollectionUtils.isEmpty(sellerIds)) {
+            designerMap = Map.of();
+        } else {
+            designerMap = designerMapper.selectList(
                             new LambdaQueryWrapper<DesignerEntity>()
                                     .select(DesignerEntity::getUserId, DesignerEntity::getShopName)
                                     .in(DesignerEntity::getUserId, sellerIds)
@@ -257,9 +261,9 @@ public class ListingMallServiceImpl extends ServiceImpl<ListingMallMapper, Listi
                     .collect(Collectors.toMap(
                             DesignerEntity::getUserId,
                             designer -> designer,
-                        // 如果 sellerIds 中有重复的 userId，保留第一个
                             (existing, replacement) -> existing
                     ));
+        }
 
         List<ListingMallVO> listingMallVOS = listingIds.stream()
                 .filter(entityMap::containsKey)