That was bad.

lib/api.js

@@ -505,7 +505,7 @@ secureRoutes.post('/changePayoutThreshold', function (req, res) {
     }
     threshold = global.support.decimalToCoin(threshold);
     global.mysql.query("UPDATE users SET payout_threshold = ? WHERE id = ?", [threshold, req.decoded.id]).then(function () {
-        return res.json({'msg': 'Threshold updated, set to: ' + global.config.support.coinToDecimal(threshold)});
+        return res.json({'msg': 'Threshold updated, set to: ' + global.support.coinToDecimal(threshold)});
     });
 });