Phorum Database Error

Sorry, a Phorum database error occurred.
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Error:

Key 'thread_message' doesn't exist in table 'msg' (1176): SELECT msg.* FROM phorum_messages msg USE INDEX (thread_message) WHERE msg.status = 2 AND msg.forum_id IN (39,6,2,1,27,20,46,12,43,34,21,7,40,28,44,5,35,47,3,13,22,41,29,8,4,14,48,36,11,30,23,15,37,19,9,24,10,16,26,31,32,33,17,25,38,18,42,45) AND msg.thread = 6121 AND msg.moved = 0 ORDER BY msg.datestamp DESC LIMIT 30

Backtrace:

Function interact() called at
{path to Phorum}/include/db/PhorumMysqlDB.php:163
----
Function interact() called at
{path to Phorum}/include/db/PhorumDB.php:932
----
Function get_recent_messages() called at
{path to Phorum}/include/api/feed.php:205
----
Function phorum_api_feed() called at
{path to Phorum}/feed.php:65