Set slot Flint and steel doesn't working

[RedEpic]

command /hiken3:
permission: devil.fruit.hiken3
trigger:
if slot 8 of player's current inventory is not air:
set slot 8 of player's inventory to flint and steel named "&6Hiken" with lore "Just need one hit to Kill em!"
make console execute command "/hiken4"

It works successfully in the console no errors
but the slot doesnt changed into flint and steel ? is there any wrong format?

Space & tab already settled up
MC Server Version : 1.12.2
Add-ons :
SkRayFall
SkDragon
SkQuery
Skelllett

 

[sagp15]

command /hiken3:
    permission: devil.fruit.hiken3
    trigger:
        if slot 8 of player's inventory is not air:
            set slot 8 of player's inventory to flint and steel named "&6Hiken" with lore "Just need one hit to Kill em!"

Now is working, just remember that if you don't have any item in slot 8 it will not work.