A couple more.

code/datums/traits/good.dm

@@ -201,13 +201,12 @@
 	medical_record_text = "Patient's blood tests report an abnormal concentration of red blood cells in their bloodstream."
 
 /datum/quirk/bloodpressure/add()
-	var/mob/living/M = quirk_holder
-	M.blood_ratio = 1.2
-	M.blood_volume += 150
+	quirk_holder.blood_ratio = 1.2
+	quirk_holder.blood_volume += 150
 
 /datum/quirk/bloodpressure/remove()
-	var/mob/living/M = quirk_holder
-	M.blood_ratio = 1
+	if(quirk_holder)
+		quirk_holder.blood_ratio = 1
 
 /datum/quirk/night_vision
 	name = "Night Vision"

code/modules/reagents/chemistry/recipes/special.dm

@@ -186,6 +186,7 @@ GLOBAL_LIST_INIT(food_reagents, build_reagents_to_food()) //reagentid = related
 	var/datum/chemical_reaction/recipe = get_chemical_reaction(recipe_id)
 	if(!recipe)
 		info = "This recipe is illegible."
+		return
 	var/list/dat = list("<ul>")
 	for(var/rid in recipe.required_reagents)
 		var/datum/reagent/R = GLOB.chemical_reagents_list[rid]