Created attachment 65267 [details]
xx.txt

hoow to reproduce:

Album -> Import -> From Directory  -> segv

please test new version of fltk which I built /work/built/mbuild/chip-postadal-154/

still crashes.

image_ has a value, but the Vtable appears to be NULL. some strange kind of
transient state?

(gdb) print image_
$1 = (class Fl_Image *) 0x585200
(gdb) print *image_
$2 = {_vptr.Fl_Image = 0x0, w_ = 273, h_ = 0, d_ = 1806096640, ld_ = 11046, 
  count_ = 4263434, data_ = 0x4144f0}
(gdb) frame 0
#0  0x00002b266bf3dd85 in Fl_Shared_Image::copy (this=0x61ec90, W=155, H=0)
    at Fl_Shared_Image.cxx:274
274       else temp_image = image_->copy(W, H);
(gdb) x /i $rip
0x2b266bf3dd85 <_ZN15Fl_Shared_Image4copyEii+37>:       callq  *0x10(%rax)
(gdb) x $rax+0x10
0x10:   Cannot access memory at address 0x10
(gdb) 

i guess this means image_ in this case is a pointer to a delete object

the bug is in flphoto in AVI plugin for fltk. 
Method Fl_AVI_Image::check(char const*, unsigned char*, int) return unitialized value and it caused segfault.

Fixed and submited