diff --git a/core/trino-main/src/main/java/io/trino/operator/scalar/ArrayHistogramFunction.java b/core/trino-main/src/main/java/io/trino/operator/scalar/ArrayHistogramFunction.java
index ef4b9cc93a16..21d62c4da32f 100644
--- a/core/trino-main/src/main/java/io/trino/operator/scalar/ArrayHistogramFunction.java
+++ b/core/trino-main/src/main/java/io/trino/operator/scalar/ArrayHistogramFunction.java
@@ -74,7 +74,7 @@ public static SqlMap arrayHistogram(
         ValueBlock valueBlock = arrayBlock.getUnderlyingValueBlock();
         for (int i = 0; i < arrayBlock.getPositionCount(); i++) {
             int position = arrayBlock.getUnderlyingValuePosition(i);
-            if (!arrayBlock.isNull(position)) {
+            if (!valueBlock.isNull(position)) {
                 histogram.add(0, valueBlock, position, 1L);
             }
         }