Error in SQL during cron

From the cron-log:

PDOException: SQLSTATE[42000]: Syntax error or access violation: 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 '%d, auser = auser + %d, nnode = nnode + %d, cnode = cnode + %d, pi = pi + %d, up' at line 1: UPDATE {statspro} SET nuser = nuser + %d, auser = auser + %d, nnode = nnode + %d, cnode = cnode + %d, pi = pi + %d, upi = upi + %d, error = error + %d, uerror = uerror + %d, warning = warning + %d, uwarning = uwarning + %d, emergency = emergency + %d, uemergency = uemergency + %d, alert = alert + %d, ualert = ualert + %d, critical = critical + %d, ucritical = ucritical + %d WHERE day = '%s'; Array ( [0] => 1 [1] => 0 [2] => 6 [3] => 0 [4] => 0 [5] => 0 [6] => 0 [7] => 0 [8] => 0 [9] => 0 [10] => 0 [11] => 0 [12] => 0 [13] => 0 [14] => 0 [15] => 0 [16] => 2015-09-21 ) in StatsPro->store_day() (regel 929 van /Users/bartgysens/Sites/argus/sites/all/modules/statspro/statspro.inc).