diff --git a/ate/testcase.py b/ate/testcase.py
index 8cd0458b..d192e45b 100644
--- a/ate/testcase.py
+++ b/ate/testcase.py
@@ -118,15 +118,14 @@ class TestcaseParser(object):
 
     def get_bind_item(self, item_type, item_name):
         if item_type == "function":
-            item = self.functions_binds.get(item_name)
+            if item_name in self.functions_binds:
+                return self.functions_binds[item_name]
         elif item_type == "variable":
-            item = self.variables_binds.get(item_name)
+            if item_name in self.variables_binds:
+                return self.variables_binds[item_name]
         else:
             raise exception.ParamsError("bind item should only be function or variable.")
 
-        if item:
-            return item
-
         try:
             assert self.file_path is not None
             return utils.search_conf_item(self.file_path, item_type, item_name)
diff --git a/tests/test_testcase.py b/tests/test_testcase.py
index 7cd27937..9cdee695 100644
--- a/tests/test_testcase.py
+++ b/tests/test_testcase.py
@@ -59,7 +59,8 @@ class TestcaseParserUnittest(unittest.TestCase):
             "var_2": "def",
             "var_3": 123,
             "var_4": {"a": 1},
-            "var_5": True
+            "var_5": True,
+            "var_6": None
         }
         testcase_parser = testcase.TestcaseParser(variables_binds=variable_binds)
         self.assertEqual(
@@ -106,6 +107,10 @@ class TestcaseParserUnittest(unittest.TestCase):
             testcase_parser.eval_content_variables("abc$var_4"),
             "abc{'a': 1}"
         )
+        self.assertEqual(
+            testcase_parser.eval_content_variables("$var_6"),
+            None
+        )
 
     def test_eval_content_variables_search_upward(self):
         testcase_parser = testcase.TestcaseParser()