Handle AttributeError during calltip lookup
diff --git a/Lib/idlelib/CallTips.py b/Lib/idlelib/CallTips.py
index d2fe924..7bcc1e2 100644
--- a/Lib/idlelib/CallTips.py
+++ b/Lib/idlelib/CallTips.py
@@ -112,7 +112,7 @@
             namespace.update(__main__.__dict__)
             try:
                 return eval(name, namespace)
-            except NameError:
+            except (NameError, AttributeError):
                 return None
 
 def _find_constructor(class_ob):