1 files changed, 5 insertions, 0 deletions
diff --git a/lib/gitlab/background_migration/populate_fork_networks_range.rb b/lib/gitlab/background_migration/populate_fork_networks_range.rb
index 6c355ed1e75..2ef3a207dd3 100644
--- a/lib/gitlab/background_migration/populate_fork_networks_range.rb
+++ b/lib/gitlab/background_migration/populate_fork_networks_range.rb
@@ -20,6 +20,11 @@ module Gitlab
             FROM fork_networks
             WHERE forked_project_links.forked_from_project_id = fork_networks.root_project_id
           )
+          AND EXISTS (
+            SELECT true
+            FROM projects
+            WHERE projects.id = forked_project_links.forked_from_project_id
+          )
           AND forked_project_links.id BETWEEN #{start_id} AND #{end_id}
         INSERT_NETWORKS