diff --git a/migrations/2025-05-30-225731_error_if_code_migrations_needed/down.sql b/migrations/2025-05-30-225731_error_if_code_migrations_needed/down.sql
new file mode 100644
index 000000000..9ca12fc18
--- /dev/null
+++ b/migrations/2025-05-30-225731_error_if_code_migrations_needed/down.sql
@@ -0,0 +1,3 @@
+SELECT
+;
+
diff --git a/migrations/2025-05-30-225731_error_if_code_migrations_needed/up.sql b/migrations/2025-05-30-225731_error_if_code_migrations_needed/up.sql
new file mode 100644
index 000000000..f808d756f
--- /dev/null
+++ b/migrations/2025-05-30-225731_error_if_code_migrations_needed/up.sql
@@ -0,0 +1,62 @@
+-- https://github.com/LemmyNet/lemmy/pull/5710
+-- Uncomment to test:
+-- ALTER TABLE site DROP COLUMN instance_id; INSERT INTO site (name, public_key) VALUES ('', '');
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT
+        FROM ((
+                SELECT
+                    id
+                FROM
+                    person
+                WHERE
+                    ap_id LIKE 'http://changeme%'
+                    OR (local
+                        AND public_key = ''))
+            UNION ALL (
+                SELECT
+                    id
+                FROM
+                    community
+                WHERE
+                    ap_id LIKE 'http://changeme%'
+                    OR (local
+                        AND public_key = ''))
+            UNION ALL (
+                SELECT
+                    id
+                FROM
+                    post
+                WHERE
+                    thumbnail_url NOT LIKE 'http%'
+                    OR (local
+                        AND ap_id LIKE 'http://changeme%'))
+            UNION ALL (
+                SELECT
+                    id
+                FROM
+                    comment
+                WHERE
+                    ap_id LIKE 'http://changeme%'
+                    AND local)
+            UNION ALL (
+                SELECT
+                    id
+                FROM
+                    private_message
+                WHERE
+                    ap_id LIKE 'http://changeme%'
+                    AND local)
+            UNION ALL (
+                SELECT
+                    id
+                FROM
+                    site
+                WHERE
+                    public_key = '')) AS broken_rows) THEN
+    RAISE 'Unstable upgrade: Youre on too old a version of lemmy. Upgrade to 0.19.0 first.';
+END IF;
+END
+$$;
+