diff --git a/swh/lister/bitbucket/tasks.py b/swh/lister/bitbucket/tasks.py
--- a/swh/lister/bitbucket/tasks.py
+++ b/swh/lister/bitbucket/tasks.py
@@ -38,7 +38,7 @@
     self.log.debug('%s OK (spawned %s subtasks)' % (self.name, len(ranges)))
     try:
         promise.save()  # so that we can restore the GroupResult in tests
-    except NotImplementedError:
+    except (NotImplementedError, AttributeError):
         self.log.info('Unable to call save_group with current result backend.')
     return promise.id
 
diff --git a/swh/lister/github/tasks.py b/swh/lister/github/tasks.py
--- a/swh/lister/github/tasks.py
+++ b/swh/lister/github/tasks.py
@@ -38,9 +38,8 @@
     self.log.debug('%s OK (spawned %s subtasks)' % (self.name, len(ranges)))
     try:
         promise.save()  # so that we can restore the GroupResult in tests
-    except NotImplementedError:
+    except (NotImplementedError, AttributeError):
         self.log.info('Unable to call save_group with current result backend.')
-        raise
     return promise.id
 
 
diff --git a/swh/lister/gitlab/tasks.py b/swh/lister/gitlab/tasks.py
--- a/swh/lister/gitlab/tasks.py
+++ b/swh/lister/gitlab/tasks.py
@@ -47,7 +47,7 @@
     self.log.debug('%s OK (spawned %s subtasks)' % (self.name, len(ranges)))
     try:
         promise.save()
-    except NotImplementedError:
+    except (NotImplementedError, AttributeError):
         self.log.info('Unable to call save_group with current result backend.')
     return promise.id