CCleaner 5.39.6399 heap corruption when pressing the "update" button

VBox 4.3.40
CCleaner 5.39.6399 (the current version in rapps)

When testing ros 0.4.8RC14 I noted for the first time CCleaner 5.39.6399 app was "freezing" when pressing the update button within the program (but I did not create a ticket back then).

When I retested with 0.4.9-RC-25-g98e87bc today I saw, that we can see a heap corruption when performing this operation. Time to create a ticket:

*** Assertion failed: (LastEntry + LastEntry->Size) == FirstEntry

***   Source File: ../../sdk/lib/rtl/heap.c, line 678

049RC25-heapAssertion.log
FTR: I had AC97 sound enabled in todays session.

Expected result
On 2k3sp2 this button does not lead to any crash or assertion, but will just open a browser with a website where they want to sell you their stuff
2k3sp2_ok_shouldJustLoadWebsite.webm