diff --git a/hanzi_chaizi/__init__.py b/hanzi_chaizi/__init__.py
index 98da87b..14baed5 100644
--- a/hanzi_chaizi/__init__.py
+++ b/hanzi_chaizi/__init__.py
@@ -12,7 +12,10 @@ def __init__(self):
 
     def query(self, input_char, default=None):
         result = self.data.get(input_char, default)
-        return result[0]
+        if result:
+            return result[0]
+        else:
+            return None
 
 
 if __name__ == "__main__":