Phorum Database Error

Sorry, a Phorum database error occurred.
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Error:

Table './worldbook/phorum_users' is marked as crashed and last (automatic?) repair failed (144): SELECT * FROM phorum_users WHERE user_id IN (2121)

Backtrace:

Function phorum_database_error called at
{path to Phorum}/include/db/mysql/mysqli.php:212
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Function phorum_db_interact called at
{path to Phorum}/include/db/mysql.php:3250
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Function phorum_db_user_get called at
{path to Phorum}/include/api/user.php:934
----
Function phorum_api_user_get called at
{path to Phorum}/read.php:492
----