diff --git a/data-prepper-plugins/s3-source/src/main/java/org/opensearch/dataprepper/plugins/source/S3ScanPartitionCreationSupplier.java b/data-prepper-plugins/s3-source/src/main/java/org/opensearch/dataprepper/plugins/source/S3ScanPartitionCreationSupplier.java
index 5ec4848354..f82b75d9b7 100644
--- a/data-prepper-plugins/s3-source/src/main/java/org/opensearch/dataprepper/plugins/source/S3ScanPartitionCreationSupplier.java
+++ b/data-prepper-plugins/s3-source/src/main/java/org/opensearch/dataprepper/plugins/source/S3ScanPartitionCreationSupplier.java
@@ -101,7 +101,7 @@ private List<PartitionIdentifier> listFilteredS3ObjectsForBucket(final List<Stri
                                                                      final LocalDateTime endDateTime,
                                                                      final Map<String, Object> globalStateMap) {
 
-        Instant mostRecentLastModifiedTimestamp = globalStateMap.containsKey(bucket) ? Instant.parse((String) globalStateMap.get(bucket)) : null;
+        Instant mostRecentLastModifiedTimestamp = globalStateMap.containsKey(bucket) && Objects.nonNull(globalStateMap.get(bucket)) ? Instant.parse((String) globalStateMap.get(bucket)) : null;
         final List<PartitionIdentifier> allPartitionIdentifiers = new ArrayList<>();
         ListObjectsV2Response listObjectsV2Response = null;
         do {