crash with log encoding

W10, ART1.0RC2

to reproduce:

-open the image

-apply vertical perspective correction,

-apply log encoding

crash:

LENSFUN:
camera: Nikon Corporation Nikon D5200
lens: Nikon Nikon AF-S DX Zoom-Nikkor 18-105mm f/3.5-5.6G ED VR
correction: distortion, vignetting, CA, autoscaling
[New Thread 6244.0x19ec]
[New Thread 6244.0x1504]
[New Thread 6244.0x850]
[New Thread 6244.0x24b4]
[New Thread 6244.0x2c5c]
[New Thread 6244.0x1838]
[New Thread 6244.0x1534]
AutoLog: min = 0.00108779, max = 0.947684, DR = 9.76686
gray boundaries: 0.05, 0.25
computed gray point from 97086 samples: 14.428
LENSFUN:
camera: Nikon Corporation Nikon D5200
lens: Nikon Nikon AF-S DX Zoom-Nikkor 18-105mm f/3.5-5.6G ED VR
correction: distortion, vignetting, CA, autoscaling

Thread 190 received signal SIGSEGV, Segmentation fault.
[Switching to Thread 6244.0x1504]
0x00000000006b977a in LUT<float>::operator[]<float, float, void> (
index=-nan(0x400000), this=0xb6cfa0 rtengine::Color::cachef)
at D:/ART/ARTSOURCE/ART/rtengine/LUT.h:437
437 T operator[](V index) const
(gdb) bt full
#0 0x00000000006b977a in LUT<float>::operator[]<float, float, void> (
index=-nan(0x400000), this=0xb6cfa0 rtengine::Color::cachef)
at D:/ART/ARTSOURCE/ART/rtengine/LUT.h:437
idx = -2147483648
diff = -nan(0x400000)
p1 = <optimized out>
p2 = <optimized out>
#1 rtengine::Color::computeXYZ2Lab (f=-nan(0x400000))
at D:/ART/ARTSOURCE/ART/rtengine/color.cc:1417
No locals.
#2 rtengine::Color::XYZ2Lab (X=<optimized out>, Y=-nan(0x400000),
Z=<optimized out>, L=@0x28046640: -nan(0x400000),
a=@0x27ed3c60: -nan(0x400000), b=@0x281b9020: -nan(0x400000))
at D:/ART/ARTSOURCE/ART/rtengine/color.cc:1547
x = -nan(0x400000)
z = -nan(0x400000)
y = -nan(0x400000)
fx = <optimized out>
fy = <optimized out>
fz = <optimized out>
#3 0x0000000000715375 in rtengine::Imagefloat::rgb_to_lab (
b=@0x281b9020: -nan(0x400000), a=@0x27ed3c60: -nan(0x400000),
L=@0x28046640: -nan(0x400000), x=752, y=<optimized out>, this=0x16dcd0c0)
at D:/ART/ARTSOURCE/ART/rtengine/imagefloat.cc:871
X = -nan(0x400000)
Y = -nan(0x400000)
Z = -nan(0x400000)
X = <optimized out>
Y = <optimized out>
Z = <optimized out>
#4 rtengine::Imagefloat::_ZN8rtengine10Imagefloat10rgb_to_labEb._omp_fn.0(void) () at D:/ART/ARTSOURCE/ART/rtengine/imagefloat.cc:861
Rv = <optimized out>
Bv = <optimized out>
Lv = {0, 0, 0, 0}
bv = {0, 0, 0, 0}
x = 752
Gv = <optimized out>
av = {0, 0, 0, 0}
y = <optimized out>
this = 0x16dcd0c0
#5 0x000000006360eaa0 in ?? ()
from D:\art\artinstall\master_release64generic\libgomp-1.dll
No symbol table info available.
#6 0x0000000064945092 in pthread_create_wrapper ()
from D:\art\artinstall\master_release64generic\libwinpthread-1.dll
No symbol table info available.
#7 0x00007ffef119b04a in msvcrt!_beginthreadex ()
from C:\WINDOWS\System32\msvcrt.dll
No symbol table info available.
#8 0x00007ffef119b11c in msvcrt!_endthreadex ()
from C:\WINDOWS\System32\msvcrt.dll
No symbol table info available.
#9 0x00007ffef10b7bd4 in KERNEL32!BaseThreadInitThunk ()
from C:\WINDOWS\System32\kernel32.dll
No symbol table info available.
~~#10~~ 0x00007ffef12aced1 in ntdll!RtlUserThreadStart ()
from C:\WINDOWS\SYSTEM32\ntdll.dll
No symbol table info available.
~~#11~~ 0x0000000000000000 in ?? ()
No symbol table info available.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb)

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