diff --git a/jedi/evaluate/compiled/__init__.py b/jedi/evaluate/compiled/__init__.py
index f47eabff..f62d835c 100644
--- a/jedi/evaluate/compiled/__init__.py
+++ b/jedi/evaluate/compiled/__init__.py
@@ -51,6 +51,9 @@ class CheckAttribute(object):
         self.check_name = func.__name__[2:]
 
     def __get__(self, instance, owner):
+        if instance is None:
+            return self
+
         # This might raise an AttributeError. That's wanted.
         if self.check_name == '__iter__':
             # Python iterators are a bit strange, because there's no need for
diff --git a/jedi/evaluate/compiled/subprocess/__init__.py b/jedi/evaluate/compiled/subprocess/__init__.py
index cff5ef2a..b9ddfad3 100644
--- a/jedi/evaluate/compiled/subprocess/__init__.py
+++ b/jedi/evaluate/compiled/subprocess/__init__.py
@@ -98,7 +98,10 @@ class _Subprocess(object):
         data = evaluator_id, function, args, kwargs
         pickle.dump(data, self._process.stdin, protocol=_PICKLE_PROTOCOL)
         self._process.stdin.flush()
-        return pickle.load(self._process.stdout)
+        is_exception, result = pickle.load(self._process.stdout)
+        if is_exception:
+            raise result
+        return result
 
     def terminate(self):
         self._process.terminate()
@@ -167,7 +170,10 @@ class Listener():
                 # It looks like the parent process closed. Don't make a big fuss
                 # here and just exit.
                 exit(1)
-            result = self._run(*payload)
+            try:
+                result = False, self._run(*payload)
+            except Exception as e:
+                result = True, e
             pickle.dump(result, stdout, protocol=_PICKLE_PROTOCOL)
             stdout.flush()
 
diff --git a/test/test_api/test_environment.py b/test/test_api/test_environment.py
index c049dbf5..9fddc05f 100644
--- a/test/test_api/test_environment.py
+++ b/test/test_api/test_environment.py
@@ -36,3 +36,5 @@ def test_import_module(evaluator):
     compiled_obj = evaluator.compiled_subprocess.import_module(name='math')
     assert compiled_obj.py__bool__() is True
     assert compiled_obj.type == 'file_input'
+    with pytest.raises(AttributeError):
+        assert compiled_obj.py__mro__()