2 files changed, 10 insertions, 0 deletions
diff --git a/lib/gitlab/background_migration/create_fork_network_memberships_range.rb b/lib/gitlab/background_migration/create_fork_network_memberships_range.rb
index 4b468e9cd58..c88eb9783ed 100644
--- a/lib/gitlab/background_migration/create_fork_network_memberships_range.rb
+++ b/lib/gitlab/background_migration/create_fork_network_memberships_range.rb
@@ -46,6 +46,11 @@ module Gitlab
             FROM fork_network_members
             WHERE fork_network_members.project_id = forked_project_links.forked_to_project_id
           )
+          AND EXISTS (
+            SELECT true
+            FROM projects
+            WHERE forked_project_links.forked_from_project_id = projects.id
+          )
           AND forked_project_links.id BETWEEN #{start_id} AND #{end_id}
         MISSING_MEMBERS
 
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