--- pkgutil.py	2012-05-03 14:21:53.693411804 +0400
+++ pkgutil.py.new	2012-05-03 14:24:55.100079214 +0400
@@ -451,8 +451,9 @@
     limitations regarding platform-specific special import locations such
     as the Windows registry.
     """
-    if module_or_name in sys.modules:
-        module_or_name = sys.modules[module_or_name]
+    module = sys.modules.get (module_or_name)
+    if module:
+        module_or_name = module
     if isinstance(module_or_name, ModuleType):
         module = module_or_name
         loader = getattr(module, '__loader__', None)