Nimrod on windows error

import libtcod

proc function(key: ptr TKey, mouse: ptr TMouse) {.closure.} =
  echo "test"


const # no error if var instead of const
  samples = @[function]


var
  cur_sample = 0
  key: TKey
  mouse: TMouse
  renderer_name = @["F1 GLSL   ","F2 OPENGL ","F3 SDL    "]


console_init_root(80, 50, "libtcod Nimrod sample")


while not console_is_window_closed():

  # ==== ERROR-CAUSING BLOCK ==== #
  samples[cur_sample](addr(key), addr(mouse)) # no error if using 0 instead of cur_sample
                                              # or remove just one of function's arguments

  for i in 0..NB_RENDERERS.int-1: # no error if this cycle is removed
    console_print_ex(nil, 42, 46-(NB_RENDERERS.int-i), BKGND_SET, LEFT, renderer_name[i])
  # ==== END OF ERROR CAUSING BLOCK ==== #

  console_flush();
  discard sys_check_for_event(EVENT_KEY_PRESS or EVENT_MOUSE, addr(key), addr(mouse))


#
# OUTPUT (ON WINDOWS):
#
# 24 bits font.
# key color : 0 0 0
# character for ascii code 255 is colored
#Using SDL renderer...
# test
# test
# test
# test
# test
# test
# test
# test
# test
# Assertion failed: dat != ((void *)0) && (unsigned)(x) < (unsigned)dat->w && (unsigned)(y) < (unsigned)dat->h, file src/console_c.c, line 658
#
# err:seh:raise_exception Unhandled exception code c0000005 flags 0 addr 0x4078e8
#