i saw you were using player[1] for the message that displays the maximum health.
with the corresponding lines changed and trying it on multiplayer i didn't notice any issues.
local function update_armor_equipment(playerid)
if entity_to_armor ~= nil then
-- debug("equipment : "..serpent.line(equipment.name))
debug("armoring entity : "..serpent.line(entity_to_armor.name))
local player = game.players[playerid]
armor_entity(entity_to_armor, player)
end
end
(maybe then you should change the line 116: armor_entity(vehicule, vehicule.last_user) to armor_entity(vehicule, 1) to be save // edit: nvm i just noticed the function is never called)

Hello,

Yes debug messages are not supposed to be printed in normal gameplay, I leave them in the code but disable them. Gameplay messages should be properly set to the correct player even in multiplayer.

Sorry if it's confusing :)

nope i tried it and the messages don't show up in multiplayer (only for the host)

Thanks for the report, this should be fixed in 0.3.3