Ошибка при оформлении счета "Банковский перевод"

При оформлении счета "Банковский перевод", если сумма доставки превышает сумму более 3 знаков, выходит ошибка:
A non well formed numeric value encountered
#1 number_format(1 200, 0, , ) called at [C:xampphtdocsmodulesshopincshop.inc.price.php:438]
#2 Shop_inc_price->format(1 200) called at [(null):0]
#3 call_user_func_array(Array(...), Array(...)) called at [C:xampphtdocsmodulesshopshop.inc.php:57]
#4 Shop_inc->__call(price_format, Array(...)) called at [C:xampphtdocsmodulespaymentackend on_cashpayment.non_cash.ul.php:156]
#5 Shop_inc->price_format(1 200) called at [C:xampphtdocsmodulespaymentackend on_cashpayment.non_cash.ul.php:156]
#6 include_once(C:xampphtdocsmodulespaymentackend on_cashpayment.non_cash.ul.php) called at [C:xampphtdocsmodulespaymentackend on_cashpayment.non_cash.php:43]
#7 include_once(C:xampphtdocsmodulespaymentackend on_cashpayment.non_cash.php) called at [C:xampphtdocsmodulespaymentpayment.get.php:21]
#8 include_once(C:xampphtdocsmodulespaymentpayment.get.php) called at [C:xampphtdocsincludesinit.php:257]
#9 Init->include_other_file() called at [C:xampphtdocsincludesinit.php:109]
#10 Init->start() called at [C:xampphtdocsindex.php:60]

Как быть?