Rotated Tiles code crashes upon loading a level

[Otukuoi]

After copy and pasting the rotated collision tiles code, I tried to join the first level of my fangame and it crashed after the title card. Here's the error message:

############################################################################################
ERROR in action number 1
of Other Event: User Defined 0 for object obj_player:
array_get :: argument 0 is not an array 5(00000005)
at gml_Script_scr_player_balance (line 114) - var _floor_dist = tile_find_v(x, _y, DIRECTION.POSITIVE, tile_layer)[0];
############################################################################################
gml_Script_scr_player_balance (line 114)
gml_Object_obj_player_Other_10 (line 42) - scr_player_balance();
gml_Object_c_framework_Step_1 (line 538)