Segfault when using RotoPaint Clone tool

I’m using Natron to remove background from packshots.
I’m running Natron Version 2.3.14 under Linux Mint 18.2 (KDE5 desktop).

It crashed during using RotoPaint Clone tool.

Here’s my project file (autosave):

Szparowanie_013.ntp.autosave.zip (377.2 KB)

And here’s the terminal output:

Loading project: /data/Projects/XYZ//Szparowanie_013.ntp.autosave
Caught segmentation fault (SIGSEGV) from thread Global Thread (Pooled) (0x3b00d88)(0x3b00d60), faulty address is 0x10258d3 from 0xfffffffe207f1610
Backtrace:
[Frame 1]: /data/Applications/Natron2/bin/Natron(_ZN6Natron14ViewerInstance19interpolateGammaLutEf+0x73) [0x10258d3]
[Frame 2]: /data/Applications/Natron2/bin/Natron(_ZN6Natron14ViewerInstance19interpolateGammaLutEf+0x73) [0x10258d3]
[Frame 3]: /data/Applications/Natron2/bin/Natron(_ZN6Natron27scaleToTexture8bits_genericIfLi1ELb0ELb0ELi0ELi1ELi2EEEvRKNS_5RectIERKNS_16RenderViewerArgsEiPNS_14ViewerInstanceERKNS_18UpdateViewerParams10CachedTileEPj+0x646) [0x103d206]
[Frame 4]: /data/Applications/Natron2/bin/Natron(_ZN12QtConcurrent9MapKernelISt14_List_iteratorIN6Natron18UpdateViewerParams10CachedTileEEN5boost3_bi6bind_tIvPFvRKNS2_5RectIERKNS2_16RenderViewerArgsEPNS2_14ViewerInstanceES4_ENS7_5list4INS7_5valueIS9_EENSK_ISC_EENSK_ISG_EENS6_3argILi1EEEEEEEE12runIterationES5_iPv+0x99) [0x1035749]
[Frame 5]: /data/Applications/Natron2/bin/Natron(_ZTv0_n56_N12QtConcurrent13IterateKernelISt14_List_iteratorIN6Natron18UpdateViewerParams10CachedTileEEvE14threadFunctionEv+0x71) [0x1082521]
[Frame 6]: /data/Applications/Natron2/bin/../lib/libQtCore.so.4(_ZN12QtConcurrent16ThreadEngineBase3runEv+0x4d) [0x7f615db2a37d]
[Frame 7]: /data/Applications/Natron2/bin/../lib/libQtCore.so.4(_ZN17QThreadPoolThread3runEv+0x1a2) [0x7f615db2c832]
[Frame 8]: /data/Applications/Natron2/bin/../lib/libQtCore.so.4(+0x8a7b3) [0x7f615db387b3]
[Frame 9]: /lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba) [0x7f615d6246ba]
[Frame 10]: /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f615c87841d]
terminate called without an active exception
[5]+  Killed                  ./Natron
Aborted