From gdb on the crash file:

(gdb) p *context
$1 = {state = 0, width = 0, height = 0, has_global_cmap = 0, global_color_map = {'\0' <repeats 255 times>, 
    '\0' <repeats 255 times>, '\0' <repeats 255 times>}, global_colormap_size = 0, global_bit_pixel = 0, 
  global_color_resolution = 0, background_index = 0, stop_after_first_frame = 0, frame_cmap_active = 0, 
  frame_color_map = {'\0' <repeats 255 times>, '\0' <repeats 255 times>, '\0' <repeats 255 times>}, 
  frame_colormap_size = 0, frame_bit_pixel = 0, aspect_ratio = 0, animation = 0x0, frame = 0x0, gif89 = {
    transparent = -1, delay_time = -1, input_flag = -1, disposal = -1}, frame_len = 0, frame_height = 0, 
  frame_interlace = 0, x_offset = 0, y_offset = 0, file = 0x0, prepare_func = 0, update_func = 0, user_data = 0x0, 
  buf = 0x0, ptr = 0, size = 0, amount_needed = 0, extension_label = 0 '\0', extension_flag = 0 '\0', 
  in_loop_extension = 0, block_count = 0 '\0', block_buf = '\0' <repeats 279 times>, block_ptr = 0, old_state = 0, 
  code_curbit = 0, code_lastbit = 0, code_done = 0, code_last_byte = 0, lzw_code_pending = 0, lzw_fresh = 0, 
  lzw_code_size = 0, lzw_set_code_size = 0 '\0', lzw_max_code = 0, lzw_max_code_size = 0, lzw_firstcode = 0, 
  lzw_oldcode = 0, lzw_clear_code = 0, lzw_end_code = 0, lzw_sp = 0x0, lzw_table = {{0 <repeats 4096 times>}, {
      0 <repeats 4096 times>}}, lzw_stack = {0 <repeats 8193 times>}, draw_xpos = 0, draw_ypos = 0, draw_pass = 0, 
  error = 0x0}

To make any progress here, we need the offending gif image.
Please attach it.

the submitter didn't reply, closing the bug for now