diff --git a/runpod/serverless/utils/rp_validator.py b/runpod/serverless/utils/rp_validator.py
index be9ad38a..ebb44c18 100644
--- a/runpod/serverless/utils/rp_validator.py
+++ b/runpod/serverless/utils/rp_validator.py
@@ -70,7 +70,7 @@ def _validate_input_against_schema(schema, validated_input, error_list):
 
             # Check for the correct type.
             is_instance = isinstance(validated_input[key], rules["type"])
-            if validated_input[key] is not None and not is_instance:
+            if not is_instance:
                 _add_error(
                     error_list,
                     f"{key} should be {rules['type']} type, not {type(validated_input[key])}.",
diff --git a/tests/test_serverless/test_utils/test_validate.py b/tests/test_serverless/test_utils/test_validate.py
index 65a10418..60385130 100644
--- a/tests/test_serverless/test_utils/test_validate.py
+++ b/tests/test_serverless/test_utils/test_validate.py
@@ -99,6 +99,24 @@ def test_validate_rules_not_dict(self):
         result = rp_validator.validate(self.raw_input, {"x": "not dict"})
         self.assertIn("errors", result)
 
+    def test_validate_simple_input(self):
+        """
+        Tests validate with simple input
+        """
+        result = rp_validator.validate(
+            {"my_input": None}, {"my_input": {"type": str, "required": True}}
+        )
+        self.assertIn("errors", result)
+
+    def test_validate_none_type(self):
+        """
+        Tests validate with None type
+        """
+        result = rp_validator.validate(
+            {"my_input": None}, {"my_input": {"type": type(None), "required": True}}
+        )
+        self.assertNotIn("errors", result)
+
 
 if __name__ == "__main__":
     unittest.main()