[IPB3] Converting Private Messages

[OzWookiee]

Got the following error when importing our IPB 3.1.4:

---

Private Message
MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
1064 - 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 'AND map_user_id!=1456 AND map_user_active=1' at line 1
Query:
SELECT * FROM TAG_message_topic_user_map WHERE map_topic_id= AND map_user_id!=1456 AND map_user_active=1

---

Checking the mybb_privatemessages table a single PM was imported 3 times.

Looking in the merge\boards\ipb3\privatemessages.php it appears to be line 102:
$rec_query = $this->old_db->simple_select('message_topic_user_map', '*', "map_topic_id={$data['mt_id']} AND map_user_id!={$data['msg_author_id']} AND map_user_active=1");

specifically {$data['mt_id']} has not returned any data
SELECT *
FROM TAG_message_topic_user_map
WHERE map_topic_id= AND map_user_id!=1456 AND map_user_active=1

Looking at the original query and what it returns
SELECT *
FROM ".OLD_TABLE_PREFIX."message_posts m
LEFT JOIN ".OLD_TABLE_PREFIX."message_topics mt ON(m.msg_topic_id=mt.mt_id)
LEFT JOIN ".OLD_TABLE_PREFIX."message_topic_user_map mp ON(mp.map_topic_id=mt.mt_id AND mp.map_user_id=mt.mt_starter_id)
LIMIT ".$this->trackers['start_privatemessages'].", ".$import_session['privatemessages_per_screen']

mt_id AND map_topic_id can be NULL according to my data (attached exported JSON from phpMyAdmin).
TAG_message_posts.zip

I guess this would then mean that you need to check if {$data['mt_id']} IS NULL before running that section?

[JN-Jones]

Odd, didn't know there can be messages without a topic (which doesn't make sense normally). Need to look at the cause and how this should be handled.