Fix a bunch of runtimes

code/modules/mob/living/carbon/alien/special/facehugger.dm

@@ -231,6 +231,9 @@ var/const/MAX_ACTIVE_TIME = 400
 	return
 
 /proc/CanHug(var/mob/M)
+	if(!M || !ismob(M))
+		return 0
+	
 	if(M.stat == DEAD)
 		return 0
 

code/modules/mob/living/carbon/human/human.dm

@@ -1159,11 +1159,16 @@
 
 /mob/living/carbon/human/proc/is_lung_ruptured()
 	var/datum/organ/internal/lungs/L = internal_organs_by_name["lungs"]
+	if(!L)
+		return 0
+		
 	return L.is_bruised()
 
 /mob/living/carbon/human/proc/rupture_lung()
 	var/datum/organ/internal/lungs/L = internal_organs_by_name["lungs"]
-
+	if(!L)
+		return 0
+	
 	if(!L.is_bruised())
 		src.custom_pain("You feel a stabbing pain in your chest!", 1)
 		L.damage = L.min_bruised_damage