Error getting when totals clicked from PurchTableListpage in AX 2012 R3

Getting the below error while clicking the Totals button in the PurchTableListpage form
Navigation
USMF/Accounts payable/Common/Purchase orders/All purchase orders/View/Totals

The error occurs when we disable the fact-boxes (may be some performance reasons).
USMF/System administration/Area page/Setup/System/Client Performances option

This error related to the part list object when it try to get initialize when the fact-boxes are disabled in AX system.

This can be resolved by changing the if condition as

if(partList.getPartById(counter) && partList.getPartById(counter).name() == formStr(PurchTotalsSummaryPart))

The same fix was resolved by MS in CU 10 release.