diff --git a/core/trino-spi/src/main/java/io/trino/spi/block/DictionaryBlock.java b/core/trino-spi/src/main/java/io/trino/spi/block/DictionaryBlock.java
index 69c3902fd5e4..611eb63d5f89 100644
--- a/core/trino-spi/src/main/java/io/trino/spi/block/DictionaryBlock.java
+++ b/core/trino-spi/src/main/java/io/trino/spi/block/DictionaryBlock.java
@@ -420,6 +420,9 @@ public Block getRegion(int positionOffset, int length)
     public Block copyRegion(int position, int length)
     {
         checkValidRegion(positionCount, position, length);
+        if (length == 0) {
+            return dictionary.copyRegion(0, 0);
+        }
         // Avoid repeated volatile reads to the uniqueIds field
         int uniqueIds = this.uniqueIds;
         if (length <= 1 || (uniqueIds == dictionary.getPositionCount() && isSequentialIds)) {