diff --git a/weboob/tools/application/base.py b/weboob/tools/application/base.py
index 0127c983..5e69b0f2 100644
--- a/weboob/tools/application/base.py
+++ b/weboob/tools/application/base.py
@@ -23,7 +23,7 @@ from optparse import OptionGroup, OptionParser
 
 from weboob.core.ouiboube import Weboob
 from weboob.tools.config.iconfig import ConfigError
-from weboob.tools.backend import ObjectNotAvailable, ObjectNotSupported
+from weboob.tools.backend import ObjectNotAvailable
 from weboob.tools.misc import iter_fields
 
 
@@ -201,7 +201,7 @@ class BaseApplication(object):
                 fields = [k for k, v in iter_fields(obj)]
             try:
                 backend.fillobj(obj, fields)
-            except (ObjectNotAvailable, ObjectNotSupported), e:
+            except ObjectNotAvailable, e:
                 logging.warning(u'Could not retrieve required fields (%s): %s' % (','.join(fields), e))
         return obj
 
diff --git a/weboob/tools/application/console.py b/weboob/tools/application/console.py
index b01aaf62..70b9ab11 100644
--- a/weboob/tools/application/console.py
+++ b/weboob/tools/application/console.py
@@ -29,7 +29,6 @@ import sys
 
 from weboob.core import CallErrors
 from weboob.core.backends import BackendsConfig
-from weboob.tools.backend import ObjectNotSupported
 
 from .base import BackendNotFound, BaseApplication
 from .formatters.load import formatters, load_formatter
diff --git a/weboob/tools/backend.py b/weboob/tools/backend.py
index c2721245..e1c8ae20 100644
--- a/weboob/tools/backend.py
+++ b/weboob/tools/backend.py
@@ -24,17 +24,13 @@ from logging import debug
 from weboob.capabilities.base import IBaseCap, NotLoaded
 
 
-__all__ = ['BaseBackend', 'ObjectNotAvailable', 'ObjectNotSupported']
+__all__ = ['BaseBackend', 'ObjectNotAvailable']
 
 
 class ObjectNotAvailable(Exception):
     pass
 
 
-class ObjectNotSupported(Exception):
-    pass
-
-
 class BackendStorage(object):
     def __init__(self, name, storage):
         self.name = name
@@ -222,9 +218,9 @@ class BaseBackend(object):
         if not missing_fields:
             return obj
 
+        assert obj in self.OBJECTS, 'The object of type %s is not supported by the backend %s' % (type(obj), self)
+
         for key, value in self.OBJECTS.iteritems():
             if isinstance(obj, key):
                 debug(u'Fill %r with fields: %s' % (obj, missing_fields))
                 return value(self, obj, missing_fields) or obj
-
-        raise ObjectNotSupported('The object of type %s is not supported by the backend %s' % (type(obj), self))