Posting errors

[okkboomer 1]

Everytime I try to creare a topic, I get this error. 

IPS\Db\Exception: Duplicate entry '0' for key 'PRIMARY' (1062) 

note: this happend after i moved my database

[Jeffrey 366]

ALTER TABLE `forums_topics`
  CHANGE COLUMN `id` `id` INT(11) NOT NULL AUTO_INCREMENT,
  DROP PRIMARY KEY,
  ADD PRIMARY KEY (`id`);

Run the SQL query.