diff --git a/backends-clickhouse/src/test/scala/org/apache/gluten/execution/GlutenClickhouseFunctionSuite.scala b/backends-clickhouse/src/test/scala/org/apache/gluten/execution/GlutenClickhouseFunctionSuite.scala
index 63e105e12a720..d5d967c4a427b 100644
--- a/backends-clickhouse/src/test/scala/org/apache/gluten/execution/GlutenClickhouseFunctionSuite.scala
+++ b/backends-clickhouse/src/test/scala/org/apache/gluten/execution/GlutenClickhouseFunctionSuite.scala
@@ -179,4 +179,12 @@ class GlutenClickhouseFunctionSuite extends GlutenClickHouseTPCHAbstractSuite {
         |""".stripMargin
     )(df => checkFallbackOperators(df, 0))
   }
+
+  test("GLUTEN-5981 null value from get_json_object") {
+    runQueryAndCompare(
+      """
+        |SELECT get_json_object(a, '$.a') is null from values ('{"a": null}') as t(a)
+        |""".stripMargin
+    )(df => checkFallbackOperators(df, 0))
+  }
 }
diff --git a/cpp-ch/local-engine/Functions/SparkFunctionGetJsonObject.h b/cpp-ch/local-engine/Functions/SparkFunctionGetJsonObject.h
index 6ba05e901791e..1d9b9a0fd4c1a 100644
--- a/cpp-ch/local-engine/Functions/SparkFunctionGetJsonObject.h
+++ b/cpp-ch/local-engine/Functions/SparkFunctionGetJsonObject.h
@@ -113,6 +113,8 @@ class GetJsonObjectImpl
         JSONStringSerializer serializer(*col_str);
         if (elements.size() == 1) [[likely]]
         {
+            if (elements[0].isNull())
+                return false;
             nullable_col_str.getNullMapData().push_back(0);
             if (elements[0].isString())
             {