diff --git a/modules/common/src/main/scala/com.snowplowanalytics.snowplow.enrich/common/enrichments/registry/pii/PiiPseudonymizerEnrichment.scala b/modules/common/src/main/scala/com.snowplowanalytics.snowplow.enrich/common/enrichments/registry/pii/PiiPseudonymizerEnrichment.scala
index 3d851969a..414a183ae 100644
--- a/modules/common/src/main/scala/com.snowplowanalytics.snowplow.enrich/common/enrichments/registry/pii/PiiPseudonymizerEnrichment.scala
+++ b/modules/common/src/main/scala/com.snowplowanalytics.snowplow.enrich/common/enrichments/registry/pii/PiiPseudonymizerEnrichment.scala
@@ -23,7 +23,7 @@ import io.circe.jackson._
 import io.circe.syntax._
 
 import com.fasterxml.jackson.databind.JsonNode
-import com.fasterxml.jackson.databind.node.{ArrayNode, ObjectNode, TextNode}
+import com.fasterxml.jackson.databind.node.{ArrayNode, NullNode, ObjectNode, TextNode}
 import com.fasterxml.jackson.databind.ObjectMapper
 
 import com.jayway.jsonpath.{Configuration, JsonPath => JJsonPath}
@@ -306,8 +306,9 @@ private final case class ScrambleMapFunction(
             )
             arr.add(newValue)
           case default: AnyRef => arr.add(default)
+          case null => arr.add(NullNode.getInstance())
         }
         arr
-      case default: AnyRef => default
+      case _ => currentValue
     }
 }
diff --git a/modules/common/src/test/scala/com.snowplowanalytics.snowplow.enrich.common/enrichments/registry/pii/PiiPseudonymizerEnrichmentSpec.scala b/modules/common/src/test/scala/com.snowplowanalytics.snowplow.enrich.common/enrichments/registry/pii/PiiPseudonymizerEnrichmentSpec.scala
index 3fab13138..3c124570e 100644
--- a/modules/common/src/test/scala/com.snowplowanalytics.snowplow.enrich.common/enrichments/registry/pii/PiiPseudonymizerEnrichmentSpec.scala
+++ b/modules/common/src/test/scala/com.snowplowanalytics.snowplow.enrich.common/enrichments/registry/pii/PiiPseudonymizerEnrichmentSpec.scala
@@ -116,7 +116,8 @@ class PiiPseudonymizerEnrichmentSpec extends Specification with ValidatedMatcher
         |    {
         |      "schema": "iglu:com.test/array/jsonschema/1-0-0",
         |      "data": {
-        |        "field" : ["hello", "world"]
+        |        "field" : ["hello", "world"],
+        |        "field2" : null
         |      }
         |    }
         |  ]
@@ -347,6 +348,11 @@ class PiiPseudonymizerEnrichmentSpec extends Specification with ValidatedMatcher
             schemaCriterion = SchemaCriterion("com.test", "array", "jsonschema", 1, 0, 0),
             jsonPath = "$.field"
           ),
+          PiiJson(
+            fieldMutator = JsonMutators("contexts"),
+            schemaCriterion = SchemaCriterion("com.test", "array", "jsonschema", 1, 0, 0),
+            jsonPath = "$.field2"
+          ),
           PiiJson(
             fieldMutator = JsonMutators("unstruct_event"),
             schemaCriterion = SchemaCriterion("com.mailgun", "message_clicked", "jsonschema", 1, 0, 0),