Game crash when trying to leave editor

[Rem16]

The game looks fun but I can't start because of an error.
I started a new game, built a ship according to the help. When I click the indicated green button the game crash with the folowing error :

___________________________________________
############################################################################################
FATAL ERROR in
action number 1
of Step Event0
for object obj_save_ship:

global variable name 'spr_custom' index (100405) not set before reading it.
at gml_Object_obj_save_ship_Step_0
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Object_obj_save_ship_Step_0 (line -1)

Battle mode is working though

Please, what can I do to solve this ?
Thank you in advance

[Obi-Wanya]

Thank you, I tried to fix this error in 0.7.4