fix

code/modules/mob/living/silicon/robot/robot.dm

@@ -400,7 +400,9 @@ GLOBAL_LIST_INIT(robot_verbs_default, list(
 		CRASH("[key_name_log(src)] tried to choose non-existent '[modtype]' module!")
 
 	/// module effects
-	module.on_apply(src)
+	if(!module.on_apply(src))
+		module = initial(module)
+		return
 	/// languages
 	module.add_languages(src)
 	/// subsystems
@@ -1308,6 +1310,9 @@ GLOBAL_LIST_INIT(robot_verbs_default, list(
 	if(blocks_emissive)
 		add_overlay(get_emissive_block())
 
+	if(module)
+		module.set_appearance(src)
+
 
 /mob/living/silicon/robot/proc/borg_icons() // Exists so that robot/destroyer can override it
 	return

code/modules/mob/living/silicon/robot/robot_modules.dm

@@ -51,7 +51,10 @@
 	modules += new /obj/item/flash/cyborg(src)
 
 /obj/item/robot_module/proc/on_apply(mob/living/silicon/robot/robot)
-	return
+	return TRUE
+
+/obj/item/robot_module/proc/set_appearance(mob/living/silicon/robot/robot)
+	return TRUE
 
 /obj/item/robot_module/proc/fix_modules()
 	for(var/obj/item/I in modules)
@@ -255,6 +258,8 @@
 	robot.status_flags &= ~CANPUSH
 	robot.see_reagents = TRUE
 
+	return TRUE
+
 /obj/item/robot_module/medical/New()
 	..()
 	modules += new /obj/item/healthanalyzer/advanced(src)
@@ -333,10 +338,12 @@
 
 /obj/item/robot_module/engineering/on_apply(mob/living/silicon/robot/robot)
 	if(robot.camera && ("Robots" in robot.camera.network))
-		LAZYADD(robot.camera.network, ("Engineering"))
+		LAZYADD(robot.camera.network, "Engineering")
 
 	ADD_TRAIT(robot, TRAIT_NEGATES_GRAVITY, ROBOT_TRAIT)
 
+	return TRUE
+
 /obj/item/robot_module/engineering/New()
 	..()
 	modules += new /obj/item/rcd/borg(src)
@@ -402,10 +409,12 @@
 
 		if(count_secborgs >= max_secborgs)
 			to_chat(robot, span_warning("There are too many Security cyborgs active. Please choose another module."))
-			return
+			return FALSE
 
 	robot.status_flags &= ~CANPUSH
 
+	return TRUE
+
 /obj/item/robot_module/security/New()
 	..()
 	modules += new /obj/item/restraints/handcuffs/cable/zipties(src)
@@ -472,6 +481,8 @@
 /obj/item/robot_module/butler/on_apply(mob/living/silicon/robot/robot)
 	robot.see_reagents = TRUE
 
+	return TRUE
+
 /obj/item/robot_module/butler/New()
 	..()
 
@@ -579,7 +590,9 @@
 
 /obj/item/robot_module/miner/on_apply(mob/living/silicon/robot/robot)
 	if(robot.camera && ("Robots" in robot.camera.network))
-		LAZYADD(robot.camera.network, ("Mining Outpost"))
+		LAZYADD(robot.camera.network, "Mining Outpost")
+
+	return TRUE
 
 /obj/item/robot_module/miner/New()
 	..()
@@ -645,6 +658,8 @@
 	robot.mind?.transfer_to(death)
 	qdel(robot)
 
+	return TRUE
+
 /obj/item/robot_module/deathsquad/New()
 	..()
 	modules += new /obj/item/melee/energy/sword/cyborg(src)
@@ -667,6 +682,8 @@
 	robot.spawn_syndicate_borgs(robot, "Bloodhound", get_turf(robot))
 	qdel(robot)
 
+	return TRUE
+
 /obj/item/robot_module/syndicate/New()
 	..()
 	modules += new /obj/item/melee/energy/sword/cyborg(src)
@@ -693,6 +710,8 @@
 	robot.spawn_syndicate_borgs(robot, "Medical", get_turf(robot))
 	qdel(robot)
 
+	return TRUE
+
 /obj/item/robot_module/syndicate_medical/New()
 	..()
 	modules += new /obj/item/healthanalyzer/advanced(src)
@@ -739,6 +758,8 @@
 	robot.spawn_syndicate_borgs(robot, "Saboteur", get_turf(robot))
 	qdel(src)
 
+	return TRUE
+
 /obj/item/robot_module/syndicate_saboteur/New()
 	..()
 	modules += new /obj/item/rcd/borg/syndicate(src)
@@ -783,9 +804,11 @@
 
 /obj/item/robot_module/destroyer/on_apply(mob/living/silicon/robot/robot)
 	var/mob/living/silicon/robot/destroyer/destroy = new(get_turf(robot))
-	robot.mind.transfer_to(destroy)
+	robot.mind?.transfer_to(destroy)
 	qdel(robot)
 
+	return TRUE
+
 /obj/item/robot_module/destroyer/New()
 	..()
 
@@ -813,6 +836,8 @@
 /obj/item/robot_module/combat/on_apply(mob/living/silicon/robot/robot)
 	robot.status_flags &= ~CANPUSH
 
+	return TRUE
+
 /obj/item/robot_module/combat/New()
 	..()
 	modules += new /obj/item/gun/energy/immolator/multi/cyborg(src) // primary weapon, strong at close range (ie: against blob/terror/xeno), but consumes a lot of energy per shot.
@@ -844,6 +869,8 @@
 /obj/item/robot_module/hunter/on_apply(mob/living/silicon/robot/robot)
 	robot.modtype = "Xeno-Hu"
 
+	return TRUE
+
 /obj/item/robot_module/hunter/add_default_robot_items()
 	return
 
@@ -876,6 +903,8 @@
 	robot.mind?.transfer_to(drone)
 	qdel(robot)
 
+	return TRUE
+
 /obj/item/robot_module/drone/New()
 	..()
 	modules += new /obj/item/weldingtool/largetank/cyborg(src)
@@ -928,6 +957,8 @@
 	robot.mind?.transfer_to(cogscarab)
 	qdel(robot)
 
+	return TRUE
+
 /obj/item/robot_module/cogscarab/Initialize()
 	. = ..()
 	modules += new /obj/item/weldingtool/experimental/brass(src)
@@ -962,14 +993,17 @@
 	borg_skins = list("cyborg" = "cyborg")
 
 /obj/item/robot_module/clockwork/on_apply(mob/living/silicon/robot/robot)
-	robot.icon = 'icons/mob/clockwork_mobs.dmi'
-	robot.icon_state = "cyborg"
-
 	robot.status_flags &= ~CANPUSH
 	QDEL_NULL(robot.mmi)
 
 	robot.mmi = new /obj/item/mmi/robotic_brain/clockwork(src)
 
+	return TRUE
+
+/obj/item/robot_module/clockwork/set_appearance(mob/living/silicon/robot/robot)
+	robot.icon = 'icons/mob/clockwork_mobs.dmi'
+	robot.icon_state = "cyborg"
+
 /obj/item/robot_module/clockwork/Initialize()
 	. = ..()
 	modules += new /obj/item/clockwork/clockslab(src)
@@ -1010,6 +1044,8 @@
 	robot.mind?.transfer_to(ninja)
 	qdel(robot)
 
+	return TRUE
+
 /obj/item/robot_module/ninja/New()
 	..()
 	// Ниндзя штучки