How to delete all non-active users in phpBB

When trying to convert phpBB 2 to 3, I receive the following error. How can I delete them or all non-active users without selecting them one by one?
Fatal conversion error
functions_phpbb20.php [ 1859 ]
Colliding usernames were found on your old board. In order to complete the conversion please delete or rename these users so that there is only one user on your old board for each clean username.

xelnagas is the clean username for:
» user id: 22 username: XelnagaS (0 posts)
» user id: 23 username: XelnagaS (0 posts)
skuepght is the clean username for:
» user id: 21890 username: Skuepght (0 posts)
» user id: 21891 username: Skuepght (0 posts)
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try this
mysql_query("DELETE FROM Tablename WHERE fieldname='0'");

replace tablename with the table name and fieldname with the filed name (the one that counts user's posts)

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