diff --git a/respx/patterns.py b/respx/patterns.py
index d8b00b5..8d80148 100644
--- a/respx/patterns.py
+++ b/respx/patterns.py
@@ -548,7 +548,9 @@ class Data(MultiItemsMixin, Pattern):
     value: MultiItems
 
     def clean(self, value: Dict) -> MultiItems:
-        return MultiItems(value)
+        return MultiItems(
+            (key, "" if value is None else str(value)) for key, value in value.items()
+        )
 
     def parse(self, request: httpx.Request) -> Any:
         data, _ = decode_data(request)
diff --git a/respx/utils.py b/respx/utils.py
index 5a6ce3a..5eb4715 100644
--- a/respx/utils.py
+++ b/respx/utils.py
@@ -1,7 +1,18 @@
 import email
 from datetime import datetime
 from email.message import Message
-from typing import Dict, List, NamedTuple, Optional, Tuple, Type, TypeVar, Union, cast
+from typing import (
+    Any,
+    Dict,
+    List,
+    NamedTuple,
+    Optional,
+    Tuple,
+    Type,
+    TypeVar,
+    Union,
+    cast,
+)
 from urllib.parse import parse_qsl
 
 try:
@@ -13,13 +24,13 @@
 
 
 class MultiItems(dict):
-    def get_list(self, key: str) -> List[str]:
+    def get_list(self, key: str) -> List[Any]:
         try:
             return [self[key]]
         except KeyError:  # pragma: no cover
             return []
 
-    def multi_items(self) -> List[Tuple[str, str]]:
+    def multi_items(self) -> List[Tuple[str, Any]]:
         return list(self.items())
 
 
diff --git a/tests/test_patterns.py b/tests/test_patterns.py
index dda7914..4b119aa 100644
--- a/tests/test_patterns.py
+++ b/tests/test_patterns.py
@@ -350,6 +350,18 @@ def test_content_pattern(lookup, content, expected):
             None,
             True,
         ),
+        (
+            Lookup.EQUAL,
+            {"none_value": None},
+            None,
+            True,
+        ),
+        (
+            Lookup.EQUAL,
+            {"non_str": 123},
+            None,
+            True,
+        ),
         (
             Lookup.EQUAL,
             {"x": "a"},