diff --git a/CHANGELOG.md b/CHANGELOG.md
index e590e765..36cec4c2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,9 @@
 
 ## Other changes
 - [Indexer] Fixed fields types error on instance indexer_alert_config in schema.yml - [#1499](https://github.com/jertel/elastalert2/pull/1499) - @olehpalanskyi
-- [IRIS] Changed alert_source field from static 'ElastAlert2' value to field iris_alert_source value with default of 'ElastAlert2' - @bvirgilioamnh
+- [IRIS] Changed alert_source field from static 'ElastAlert2' value to field iris_alert_source value with default of 'ElastAlert2' - [#1531](https://github.com/jertel/elastalert2/pull/1531) - @bvirgilioamnh
+- [IRIS] Fixed NoneType error raised in issue [#1457](https://github.com/jertel/elastalert2/issues/1457) - [#1533](https://github.com/jertel/elastalert2/pull/1533) - @bvirgilioamnh
+
 
 # 2.19.0
 
diff --git a/elastalert/alerters/iris.py b/elastalert/alerters/iris.py
index a804a285..be96a2c5 100644
--- a/elastalert/alerters/iris.py
+++ b/elastalert/alerters/iris.py
@@ -65,9 +65,11 @@ def make_alert_context_records(self, matches):
     def make_iocs_records(self, matches):
         iocs = []
         for record in self.iocs:
-            record['ioc_value'] = lookup_es_key(matches[0], record['ioc_value'])
-            if record['ioc_value'] is not None:
-                iocs.append(record)
+            # Duplicating match record data so we can update the ioc_value without overwriting record
+            record_data = record.copy()
+            record_data['ioc_value'] = lookup_es_key(matches[0], record['ioc_value'])
+            if record_data['ioc_value'] is not None:
+                iocs.append(record_data)
         return iocs
 
     def make_alert(self, matches):
diff --git a/tests/alerters/iris_test.py b/tests/alerters/iris_test.py
index f7832537..14647008 100644
--- a/tests/alerters/iris_test.py
+++ b/tests/alerters/iris_test.py
@@ -106,6 +106,73 @@ def test_iris_make_iocs_records(caplog):
     assert expected_data == actual_data
 
 
+def test_iris_handle_multiple_alerts_with_iocs(caplog):
+    caplog.set_level(logging.INFO)
+    rule = {
+        'name': 'Test Context',
+        'type': 'any',
+        'iris_type': 'alert',
+        'iris_host': '127.0.0.1',
+        'iris_api_token': 'token 12345',
+        'iris_customer_id': 1,
+        'iris_iocs': [
+            {
+                'ioc_description': 'source address',
+                'ioc_tags': 'ip, ipv4',
+                'ioc_tlp_id': 1,
+                'ioc_type_id': 76,
+                'ioc_value': 'src_ip'
+            },
+            {
+                'ioc_description': 'target username',
+                'ioc_tags': 'login, username',
+                'ioc_tlp_id': 3,
+                'ioc_type_id': 3,
+                'ioc_value': 'username'
+            },
+            {
+                'ioc_description': 'empty ioc',
+                'ioc_tags': 'ioc',
+                'ioc_tlp_id': 3,
+                'ioc_type_id': 3,
+                'ioc_value': 'non_existent_data'
+            }
+        ],
+        'alert': []
+    }
+
+    rules_loader = FileRulesLoader({})
+    rules_loader.load_modules(rule)
+    alert = IrisAlerter(rule)
+
+    match = {
+        '@timestamp': '2023-10-21 20:00:00.000', 'username': 'evil_user', 'src_ip': '172.20.1.1', 'dst_ip': '10.0.0.1',
+        'event_type': 'login', 'event_status': 'success'
+    }
+
+    expected_data = [
+        {
+            'ioc_description': 'source address',
+            'ioc_tags': 'ip, ipv4',
+            'ioc_tlp_id': 1,
+            'ioc_type_id': 76,
+            'ioc_value': '172.20.1.1'
+        },
+        {
+            'ioc_description': 'target username',
+            'ioc_tags': 'login, username',
+            'ioc_tlp_id': 3,
+            'ioc_type_id': 3,
+            'ioc_value': 'evil_user'
+        }
+    ]
+
+    # Submitting a bogus alert to test follow up alerts
+    alert.make_iocs_records([match])
+    actual_data = alert.make_iocs_records([match])
+    assert expected_data == actual_data
+
+
 def test_iris_make_alert_minimal(caplog):
     caplog.set_level(logging.INFO)
     rule = {