Out of memory

Downloaded var folder of a server.

WinSCP 6.3.5

Error message:
Out of memory

Stapelverfolgung:
(002A7A1A)
(002A7A1A)
(00AFA93B)
(00BF5622)
(00BC998B)
(00BC9A89)
(00B70F1D)
(00AD6DF1)
(00AC1536)
(00AC1824)
(00ADD0D2)
(00ADD3EA)
(00BCB362)
(00BCB80A)
(00BCC38D)
(00C5D803)
(000C5F21)
(0001C5EA)
(00054FDF)
(00054F9C)
(00226F2C)
(00032801)USER32.dll
(00023601)USER32.dll
(00021EC0)USER32.dll
(00021A0B)USER32.dll

(00E24BDD)
(00E261B7)
(000C5F6A)
(0001C5EA)
(00054FDF)
(00054F9C)
(00226F2C)
(00032801)USER32.dll
(00023601)USER32.dll
(00021EC0)USER32.dll
(00021A0B)USER32.dll

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.