diff --git a/src/memory/params.py b/src/memory/params.py
index bd21e035..52995a95 100644
--- a/src/memory/params.py
+++ b/src/memory/params.py
@@ -194,7 +194,8 @@ class Params(object):
                             C.PROF_KEY_DEFAULT for default profile
         @param return_profile_keys: if True, return unmanaged profile keys (like C.PROF_KEY_ALL). This keys must be managed by the caller
         @return: requested profile name
-        @raise exceptions.ProfileUnknownError if profile doesn't exists
+        @raise exceptions.ProfileUnknownError: profile doesn't exists
+        @raise exceptions.ProfileNotSetError: if C.PROF_KEY_NONE is used
         """
         if profile_key == '@DEFAULT@':
             default = self.host.memory.memory_data.get('Profile_default')
@@ -204,7 +205,7 @@ class Params(object):
                     default = self.host.memory.memory_data['Profile_default'] = self.storage.getProfilesList()[0]
                 except IndexError:
                     log.info(_('No profile exist yet'))
-                    return ""
+                    raise exceptions.ProfileUnknownError
             return default  # FIXME: temporary, must use real default value, and fallback to first one if it doesn't exists
         elif profile_key == C.PROF_KEY_NONE:
             raise exceptions.ProfileNotSetError