rt segfault 2017-12-07

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[New Thread 0x7fff94983700 (LWP 15444)]
[New Thread 0x7fff7effd700 (LWP 15445)]

Thread 583 "rawtherapee" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fff7effd700 (LWP 15445)]
0x0000555555f3b73f in LUT<float>::operator[]<float, void> (this=0x5555568748a0 <rtengine::Color::denoiseGammaTab>, index=-nan(0x400000))
    at /home/johan/rt-dev_source/rtengine/LUT.h:468
468         T p1 = data[idx];

(gdb) bt full
#0  0x0000555555f3b73f in LUT<float>::operator[]<float, void>(float) const (this=0x5555568748a0 <rtengine::Color::denoiseGammaTab>, index=-nan(0x400000))
    at /home/johan/rt-dev_source/rtengine/LUT.h:468
        idx = -2147483648
        diff = -nan(0x400000)
        p1 = 0.588235259
        p2 = -nan(0x400000)
#1  0x000055555617d416 in rtengine::ImProcFunctions::RGB_denoise(int, rtengine::Imagefloat*, rtengine::Imagefloat*, rtengine::Imagefloat*, float*, float*, float*, bool, rtengine::procparams::DirPyrDenoiseParams const&, double, rtengine::NoiseCurve const&, rtengine::NoiseCurve const&, float&, float&) [clone ._omp_fn.10] (this=0x0, kall=0, src=0x0, dst=0x0, calclum=0x0, ch_M=0x0, max_r=0x0, max_b=0x0, isRAW=false, dnparams=..., expcomp=0, noiseLCurve=..., noiseCCurve=..., nresi=<error reading variable>, highresi=<error reading variable>) at /home/johan/rt-dev_source/rtengine/FTblockDN.cc:1618
        a = 1.32751465
        c_h = 95.1139755
        L = -nan(0x400000)
        b = -9.66186714
        X = -nan(0x400000)
        j1 = 0
        Y = -nan(0x400000)
        g_ = -nan(0x400000)
        b_ = -nan(0x400000)
        Z = -nan(0x400000)
        r_ = -nan(0x400000)
        j = 0
        i1 = 96
        i = 96
        newGain = 0
        numblox_W = 0
        numblox_H = 0
        Hmask = 0x0
        Vmask = 0x0
        realblue = 0
        Lin = 0x0
        tileright = 0
        tilebottom = 0
        width = 0
        labdn = 0x0
        intermred = 0
        width2 = 0
        execwavelet = false
        noisevarab_r = 0
        noisevarab_b = 0
        maxNoiseVarab = 0
        interm_medT = 0
        tileleft = 0
        realred = 0
        interm_med = 0
        tiletop = 0
        height = 0
        intermblue = 0
        noisevarlum = 0x0
        pos = 0
        noisevarchrom = 0x0
        tileWskip = 0
        tileHskip = 0
        plan_backward_blox = {0x0, 0x0}
        oldNested = false
        tilewidth = 0
        max_numblox_W = 0
        numthreads = 0
        wp = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}}
        numtiles = 0
        plan_forward_blox = {0x0, 0x0}
        fLbloxArray = Python Exception <class 'gdb.MemoryError'> Cannot access memory at address 0x0:
        #2  0x00007ffff2ef9d31 in  () at /usr/lib/x86_64-linux-gnu/libgomp.so.1
        #3  0x00007ffff2ab47fc in start_thread (arg=0x7fff7effd700) at pthread_create.c:465
        pd = 0x7fff7effd700
        now = <optimised out>
        unwind_buf =
              {cancel_jmp_buf = {{jmp_buf = {140735324083968, 8252517069758273959, 140736520997822, 140736520997823, 140735324083968, 140735324084672, -8252800745206048345, -8252510023057794649}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimised out>
        pagesize_m1 = <optimised out>
        sp = <optimised out>
        freesize = <optimised out>
        __PRETTY_FUNCTION__ = "start_thread"
#4  0x00007ffff27e1b0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95