diff --git a/hutool-core/src/main/java/cn/hutool/core/stream/CollectorUtil.java b/hutool-core/src/main/java/cn/hutool/core/stream/CollectorUtil.java
index 29c485a49..35d3ecc8c 100644
--- a/hutool-core/src/main/java/cn/hutool/core/stream/CollectorUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/stream/CollectorUtil.java
@@ -488,7 +488,7 @@ public class CollectorUtil {
 				recursiveRef.get().accept(children);
 			});
 			final List<T> parents = parentFactory.apply(pIdValuesMap);
-			if (!parents.isEmpty()) {
+			if (false == parents.isEmpty()) {
 				recursiveRef.set(recursive);
 				recursiveRef.get().accept(parents);
 			}