Merge pull request #9662 from Ghommie/Ghommie-cit294

Fixes some average runtimes, how null...

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

@@ -98,7 +98,7 @@
 	var/datum/gas_mixture/breath
 
 	if(!getorganslot(ORGAN_SLOT_BREATHING_TUBE))
-		if(health <= HEALTH_THRESHOLD_FULLCRIT || (pulledby && pulledby.grab_state >= GRAB_KILL) || lungs.organ_flags & ORGAN_FAILING)
+		if(health <= HEALTH_THRESHOLD_FULLCRIT || (pulledby && pulledby.grab_state >= GRAB_KILL) || !lungs || lungs.organ_flags & ORGAN_FAILING)
 			losebreath++  //You can't breath at all when in critical or when being choked, so you're going to miss a breath
 
 		else if(health <= crit_threshold)

code/modules/surgery/organs/eyes.dm

@@ -338,7 +338,7 @@
 /obj/item/organ/eyes/robotic/glow/proc/start_visuals()
 	if(!islist(eye_lighting))
 		regenerate_light_effects()
-	if((eye_lighting.len < light_beam_distance) || !on_mob)
+	if((LAZYLEN(eye_lighting) < light_beam_distance) || !on_mob)
 		regenerate_light_effects()
 	sync_light_effects()
 	update_visuals()

code/modules/surgery/surgery.dm

@@ -92,7 +92,7 @@
 			return TRUE
 		if(iscyborg(user) && user.a_intent != INTENT_HARM) //to save asimov borgs a LOT of heartache
 			return TRUE
-		if(tool.item_flags & SURGICAL_TOOL) //Just because you used the wrong tool it doesn't mean you meant to whack the patient with it
+		if(tool && tool.item_flags & SURGICAL_TOOL) //Just because you used the wrong tool it doesn't mean you meant to whack the patient with it
 			to_chat(user, "<span class='warning'>This step requires a different tool!</span>")
 			return TRUE
 

code/modules/vore/eating/belly_obj.dm

@@ -158,7 +158,7 @@
 
 /obj/belly/Destroy()
 	SSbellies.belly_list -= src
-	if(owner)
+	if(owner?.vore_organs)
 		owner.vore_organs -= src
 		owner = null
 	. = ..()