diff --git a/schema.py b/schema.py
index 8fb9f6f..5b25f48 100644
--- a/schema.py
+++ b/schema.py
@@ -16,7 +16,8 @@
 class SchemaError(Exception):
     """Error during Schema validation."""
 
-    def __init__(self, autos, errors):
+    def __init__(self, autos, errors=None):
+        errors = [] if errors is None else errors
         self.autos = autos if type(autos) is list else [autos]
         self.errors = errors if type(errors) is list else [errors]
         Exception.__init__(self, self.code)