Merge pull request #3496 from Citadel-Station-13/upstream-merge-31609

[MIRROR] Adds type checks to HUD alert clicks to prevent ghosts from causing runtimes

code/_onclick/hud/alert.dm

@@ -243,7 +243,7 @@ or shoot a gun to move around via Newton's 3rd Law of Motion."
 
 /obj/screen/alert/fire/Click()
 	var/mob/living/L = usr
-	if(!L.can_resist())
+	if(!istype(L) || !L.can_resist())
 		return
 	L.changeNext_move(CLICK_CD_RESIST)
 	if(L.canmove)
@@ -559,7 +559,7 @@ so as to remain in compliance with the most up-to-date laws."
 
 /obj/screen/alert/restrained/Click()
 	var/mob/living/L = usr
-	if(!L.can_resist())
+	if(!istype(L) || !L.can_resist())
 		return
 	L.changeNext_move(CLICK_CD_RESIST)
 	if((L.canmove) && (L.last_special <= world.time))
@@ -567,7 +567,7 @@ so as to remain in compliance with the most up-to-date laws."
 
 /obj/screen/alert/restrained/buckled/Click()
 	var/mob/living/L = usr
-	if(!L.can_resist())
+	if(!istype(L) || !L.can_resist())
 		return
 	L.changeNext_move(CLICK_CD_RESIST)
 	if(L.last_special <= world.time)

code/modules/mob/living/living.dm

@@ -586,7 +586,7 @@
 	if(!force_moving)
 		..(pressure_difference, direction, pressure_resistance_prob_delta)
 
-/mob/living/proc/can_resist()
+/mob/living/can_resist()
 	return !((next_move > world.time) || incapacitated(ignore_restraints = TRUE))
 
 /mob/living/verb/resist()

code/modules/mob/mob.dm

@@ -356,6 +356,9 @@
 		else
 			M.LAssailant = usr
 
+/mob/proc/can_resist()
+	return FALSE		//overridden in living.dm
+
 /mob/proc/spin(spintime, speed)
 	set waitfor = 0
 	var/D = dir