diff --git a/scaleway_functions_python/local/event.py b/scaleway_functions_python/local/event.py
index d6a8840..1e98727 100644
--- a/scaleway_functions_python/local/event.py
+++ b/scaleway_functions_python/local/event.py
@@ -41,6 +41,6 @@ def format_http_event(request: "Request") -> "Event":
     try:
         b64decode(body, validate=True).decode("utf-8")
         event["isBase64Encoded"] = True
-    except (binascii.Error, UnicodeDecodeError):
+    except (binascii.Error, UnicodeDecodeError, ValueError):
         pass
     return event
diff --git a/tests/test_local/test_event.py b/tests/test_local/test_event.py
index 37af42e..06137ff 100644
--- a/tests/test_local/test_event.py
+++ b/tests/test_local/test_event.py
@@ -1,5 +1,6 @@
 import pytest
-from flask import Flask, request
+from flask import Flask, Request, request
+from werkzeug.test import EnvironBuilder
 
 from scaleway_functions_python.local.event import format_http_event
 
@@ -48,3 +49,16 @@ def test_format_http_event(app):
         assert event["requestContext"] == expected_request_context
 
         assert event["body"] == ""
+
+def test_format_http_event_with_non_unicode_body():
+    # Create a request with non-unicode body
+    non_unicode_body = b'\xff\xfe\xfd'  # Invalid UTF-8 sequence
+    builder = EnvironBuilder(method='POST', data=non_unicode_body)
+    r = Request(builder.get_environ())
+
+    # Call the function and check the result
+    event = format_http_event(r)
+
+    assert event is not None
+    assert 'body' in event
+    assert event.get('isBase64Encoded', False) is False