diff --git a/graphql/error/base.py b/graphql/error/base.py
index 2865e4a4..2ed1803f 100644
--- a/graphql/error/base.py
+++ b/graphql/error/base.py
@@ -44,7 +44,6 @@ def __init__(
         self._locations = locations
         self.path = path
         self.extensions = extensions
-        return None
 
     @property
     def source(self):
diff --git a/graphql/execution/base.py b/graphql/execution/base.py
index d71151a5..240b95c1 100644
--- a/graphql/execution/base.py
+++ b/graphql/execution/base.py
@@ -48,6 +48,9 @@ def __eq__(self, other):
             and self.invalid == other.invalid
         )
 
+    def __str__(self):
+        return str(self.to_dict())
+
     def to_dict(self, format_error=None, dict_class=OrderedDict):
         # type: (Optional[Callable[[Exception], Dict]], Type[Dict]) -> Dict[str, Any]
         if format_error is None: