diff --git a/httprunner/utils.py b/httprunner/utils.py
index caf9c2b6..f515f70a 100644
--- a/httprunner/utils.py
+++ b/httprunner/utils.py
@@ -155,10 +155,16 @@ def deep_update_dict(origin_dict, override_dict):
          override_dict = {'b': {'c': 3}}
     return: {'a': 1, 'b': {'c': 3, 'd': 4}}
     """
+    if not override_dict:
+        return origin_dict
+
     for key, val in override_dict.items():
         if isinstance(val, dict):
             tmp = deep_update_dict(origin_dict.get(key, {}), val)
             origin_dict[key] = tmp
+        elif val is None:
+            # fix #64: when headers in test is None, it should inherit from config
+            continue
         else:
             origin_dict[key] = override_dict[key]
 
diff --git a/tests/data/test_bugfix.yml b/tests/data/test_bugfix.yml
new file mode 100644
index 00000000..b00e5c7d
--- /dev/null
+++ b/tests/data/test_bugfix.yml
@@ -0,0 +1,13 @@
+- config:
+    name: "bugfix testcases."
+    request:
+        base_url: http://127.0.0.1:5000
+        headers:
+            Content-Type: application/json
+
+- test:
+    name: get headers from config
+    request:
+        url: /api/users/1000
+        method: GET
+        headers:
diff --git a/tests/test_runner.py b/tests/test_runner.py
index 3382ee23..03dc34b4 100644
--- a/tests/test_runner.py
+++ b/tests/test_runner.py
@@ -1,8 +1,7 @@
 import os
 import time
 
-from httprunner import exception, runner, testcase
-
+from httprunner import exception, runner, testcase, utils
 from tests.base import ApiServerUnittest
 
 
@@ -132,3 +131,16 @@ class TestRunner(ApiServerUnittest):
         result = self.test_runner.run(testcase_file_path, variables_mapping)
         self.assertTrue(result["success"])
         self.assertIn("token", result["output"])
+
+    def test_run_testcase_with_empty_header(self):
+        testcase_file_path = os.path.join(
+            os.getcwd(), 'tests/data/test_bugfix.yml')
+        testsets = testcase.load_testcases_by_path(testcase_file_path)
+        testset = testsets[0]
+        config_dict_headers = testset["config"]["request"]["headers"]
+        test_dict_headers = testset["testcases"][0]["request"]["headers"]
+        headers = utils.deep_update_dict(
+            config_dict_headers,
+            test_dict_headers
+        )
+        self.assertEqual(headers["Content-Type"], "application/json")
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 7007c369..046058f6 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -163,12 +163,12 @@ class TestUtils(ApiServerUnittest):
         functions_mapping["endswith"](12345, 45)
 
     def test_deep_update_dict(self):
-        origin_dict = {'a': 1, 'b': {'c': 3, 'd': 4}, 'f': 6}
-        override_dict = {'a': 2, 'b': {'c': 33, 'e': 5}, 'g': 7}
+        origin_dict = {'a': 1, 'b': {'c': 3, 'd': 4}, 'f': 6, 'h': 123}
+        override_dict = {'a': 2, 'b': {'c': 33, 'e': 5}, 'g': 7, 'h': None}
         updated_dict = utils.deep_update_dict(origin_dict, override_dict)
         self.assertEqual(
             updated_dict,
-            {'a': 2, 'b': {'c': 33, 'd': 4, 'e': 5}, 'f': 6, 'g': 7}
+            {'a': 2, 'b': {'c': 33, 'd': 4, 'e': 5}, 'f': 6, 'g': 7, 'h': 123}
         )
 
     def test_get_imported_module(self):