Hello:
With Cornerstone try insert a cache row in wp_postmeta table in Wordpress shows this error
Error Duplicate entry ‘0’ for key ‘PRIMARY’ on WordPress databe for INSERT INTO pc_postmeta (post_id, meta_key, meta_value)…
Cornerstone failed to insert for Autoincrement ID and then, for any reason, delete the private key and insert with ID 0.
Can you help me to solve this issue?