Database error

Hi Matthias,

thank you for this great plugin.
We have some error about database query.

Paymill ver: 1.6.9
WP_debug: true (env test)

Error:

-WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘wp_paymill_clients’ at line 1]
SHOW TABLES LIKE wp_paymill_clients
-WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ” at line 1]
ALTER TABLE wp_paymill_clients ADD
-WordPress database error: [Duplicate key name ‘wp_member_id’]
ALTER TABLE wp_paymill_clients ADD UNIQUE KEY wp_member_id (paymill_client_id,wp_member_id)
-WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ” at line 1]
ALTER TABLE wp_paymill_transactions ADD
-WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘interval interval longtext CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL’ at line 1]
ALTER TABLE wp_paymill_cache_offers CHANGE COLUMN interval interval longtext CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL
-WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ” at line 1]
ALTER TABLE wp_paymill_cache_offers ADD
-WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ” at line 1]
ALTER TABLE wp_paymill_subscriptions ADD

Thank you

David

https://wordpress.org/plugins/paymill/