diff --git a/code/game/gamemodes/changeling/changeling_powers.dm b/code/game/gamemodes/changeling/changeling_powers.dm
index cf045d0464a..878714e381c 100644
--- a/code/game/gamemodes/changeling/changeling_powers.dm
+++ b/code/game/gamemodes/changeling/changeling_powers.dm
@@ -35,29 +35,29 @@
 
 //Helper proc. Does all the checks and stuff for us to avoid copypasta
 /mob/proc/changeling_power(var/required_chems=0, var/required_dna=0, var/max_genetic_damage=100, var/max_stat=0)
-	if(!src)			return
-	if(!src.mind)		return
-	if(!iscarbon(src))	return
+	if(!usr)			return
+	if(!usr.mind)		return
+	if(!iscarbon(usr))	return
 
-	var/datum/changeling/changeling = src.mind.changeling
+	var/datum/changeling/changeling = usr.mind.changeling
 	if(!changeling)
-		world.log << "[src] has the changeling_transform() verb but is not a changeling."
+		world.log << "[usr] has the changeling_transform() verb but is not a changeling."
 		return
 
 	if(usr.stat > max_stat)
-		src << "<span class='warning'>We are incapacitated.</span>"
+		usr << "<span class='warning'>We are incapacitated.</span>"
 		return
 
 	if(changeling.absorbed_dna.len < required_dna)
-		src << "<span class='warning'>We require at least [required_dna] samples of compatible DNA.</span>"
+		usr << "<span class='warning'>We require at least [required_dna] samples of compatible DNA.</span>"
 		return
 
 	if(changeling.chem_charges < required_chems)
-		src << "<span class='warning'>We require at least [required_chems] units of chemicals to do that!</span>"
+		usr << "<span class='warning'>We require at least [required_chems] units of chemicals to do that!</span>"
 		return
 
 	if(changeling.geneticdamage > max_genetic_damage)
-		src << "<span class='warning'>Our geneomes are still reassembling. We need time to recover first.</span>"
+		usr << "<span class='warning'>Our geneomes are still reassembling. We need time to recover first.</span>"
 		return
 
 	return changeling
diff --git a/code/game/machinery/camera/tracking.dm b/code/game/machinery/camera/tracking.dm
index 8df77e16708..7d7a1d8ef04 100644
--- a/code/game/machinery/camera/tracking.dm
+++ b/code/game/machinery/camera/tracking.dm
@@ -23,9 +23,12 @@
 	for(var/mob/living/M in mob_list)
 		// Easy checks first.
 		// Don't detect mobs on Centcom. Since the wizard den is on Centcomm, we only need this.
-		if(M.loc.z == 2)
+		var/turf/T = get_turf(M)
+		if(!T)
 			continue
-		if(M.loc.z > 6)
+		if(T.z == 2)
+			continue
+		if(T.z > 6)
 			continue
 		if(M == usr)
 			continue
diff --git a/code/modules/mob/living/carbon/alien/larva/life.dm b/code/modules/mob/living/carbon/alien/larva/life.dm
index bb516d06777..95b5ffe6d91 100644
--- a/code/modules/mob/living/carbon/alien/larva/life.dm
+++ b/code/modules/mob/living/carbon/alien/larva/life.dm
@@ -216,11 +216,12 @@
 
 		//If there are alien weeds on the ground then heal if needed or give some toxins
 		if(locate(/obj/effect/alien/weeds) in loc)
-			if(health >= 25)
-				adjustToxLoss(5)
+			if(health >= maxHealth)
+				adjustToxLoss(plasma_rate)
 			else
-				adjustBruteLoss(-5)
-				adjustFireLoss(-5)
+				adjustBruteLoss(-heal_rate)
+				adjustFireLoss(-heal_rate)
+				adjustOxyLoss(-heal_rate)
 
 		return
 
diff --git a/code/modules/mob/living/silicon/ai/freelook/chunk.dm b/code/modules/mob/living/silicon/ai/freelook/chunk.dm
index 0a9bbf44dfc..5618c347932 100644
--- a/code/modules/mob/living/silicon/ai/freelook/chunk.dm
+++ b/code/modules/mob/living/silicon/ai/freelook/chunk.dm
@@ -88,6 +88,8 @@
 			obscured -= t.obscured
 			for(var/eye in seenby)
 				var/mob/aiEye/m = eye
+				if(!m || !m.ai)
+					continue
 				if(m.ai.client)
 					m.ai.client.images -= t.obscured
 
@@ -100,8 +102,9 @@
 			obscured += t.obscured
 			for(var/eye in seenby)
 				var/mob/aiEye/m = eye
-				if(!m)
+				if(!m || !m.ai)
 					seenby -= m
+					continue
 				if(m.ai.client)
 					m.ai.client.images += t.obscured