When trying to create finger prints, digikam crashes.

Reproducible: Always

Steps to Reproduce:
1.Start digiKam 
2.Select folder with large number of pictures, 
3.Select Tools -> Maintenance -> Rebuild Fingerprints 
4.Wait for it to fail.

Actual Results:  
Get crash window

Expected Results:  
Finished fingerprinting all images and allowed me to add tags as needed. 


Some backtraces:

-------------------------------------------------------------------------------------------------------------
-- multi core

[New Thread 1308.0x1500]
[New Thread 1308.0x1954]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1308.0x1640]
0x031137b0 in digikamlib!?metaObject@SharpSettings@Digikam@@UBEPBUQMetaObject@@XZ ()
   from C:\Program Files (x86)\digiKam\bin\digikamlib.dll
(gdb) bt
#0  0x031137b0 in digikamlib!?metaObject@SharpSettings@Digikam@@UBEPBUQMetaObject@@XZ ()
   from C:\Program Files (x86)\digiKam\bin\digikamlib.dll
#1  0x3bb67641 in ?? ()
#2  0x07e10150 in ?? ()
#3  0xba000000 in ?? ()
#4  0x00000bc0 in ?? ()
#5  0x000007d0 in ?? ()
#6  0x7cab0020 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb)


-------------------------------------------------------------------------------------------------------------
-- single core

warning: QThread::start: Failed to create thread (Der Zugriffscode ist unzul?ssig.)

gdb: unknown target exception 0xe06d7363 at 0x7704c42d

Program received signal ?, Unknown signal.
[Switching to Thread 6476.0x1bac]
0x7704c42d in RaiseException () from C:\Windows\syswow64\KernelBase.dll
(gdb) bt
#0  0x7704c42d in RaiseException () from C:\Windows\syswow64\KernelBase.dll
#1  0x7851872d in MSVCR100!_CxxThrowException () from C:\Program Files (x86)\digiKam\bin\msvcr100.dll
#2  0x6621a283 in QtCore4!?qBadAlloc@@YAXXZ () from C:\Program Files (x86)\digiKam\bin\QtCore4.dll
(gdb)



-------------------------------------------------------------------------------------------------------------
-- single core
-- 600MB memory, 3,6 GB free
-- 18795 finger prints processed
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 6572.0x1b1c]
0x514637b0 in digikamlib!?metaObject@SharpSettings@Digikam@@UBEPBUQMetaObject@@XZ ()
   from C:\Program Files (x86)\digiKam\bin\digikamlib.dll
(gdb) bt
#0  0x514637b0 in digikamlib!?metaObject@SharpSettings@Digikam@@UBEPBUQMetaObject@@XZ ()
   from C:\Program Files (x86)\digiKam\bin\digikamlib.dll
#1  0x4659d7f1 in ?? ()
#2  0x79a38070 in ?? ()
#3  0xba000000 in ?? ()
#4  0x00000bc0 in ?? ()
#5  0x000007d0 in ?? ()
#6  0x7caf0020 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb)