diff --git a/auxmos.dll b/auxmos.dll
index 6340f6f0a3..797416f7d8 100644
Binary files a/auxmos.dll and b/auxmos.dll differ
diff --git a/auxmos.pdb b/auxmos.pdb
index 78273d090d..b6224679d5 100644
Binary files a/auxmos.pdb and b/auxmos.pdb differ
diff --git a/code/modules/atmospherics/gasmixtures/gas_mixture.dm b/code/modules/atmospherics/gasmixtures/gas_mixture.dm
index d415536c4d..dd2fe3784c 100644
--- a/code/modules/atmospherics/gasmixtures/gas_mixture.dm
+++ b/code/modules/atmospherics/gasmixtures/gas_mixture.dm
@@ -105,9 +105,12 @@ GLOBAL_LIST_INIT(auxtools_atmos_initialized,FALSE)
 		message_admins("[key_name(usr)] modified gas mixture [REF(src)]: Changed volume to [volume].")
 		set_volume(volume)
 
+/*
+we use a hook instead
 /datum/gas_mixture/Del()
 	__gasmixture_unregister()
 	. = ..()
+	*/
 
 /datum/gas_mixture/proc/__gasmixture_unregister()
 /datum/gas_mixture/proc/__gasmixture_register()
diff --git a/code/modules/surgery/organs/lungs.dm b/code/modules/surgery/organs/lungs.dm
index 8a1283769e..e421a9ee3a 100644
--- a/code/modules/surgery/organs/lungs.dm
+++ b/code/modules/surgery/organs/lungs.dm
@@ -195,7 +195,9 @@
 			mole_adjustments[entry] = -required_moles
 			mole_adjustments[breath_results[entry]] = required_moles
 		if(required_pp < safe_min)
-			var/multiplier = handle_too_little_breath(H, required_pp, safe_min, required_moles) / required_moles
+			var/multiplier = 0
+			if(required_moles > 0)
+				multiplier = handle_too_little_breath(H, required_pp, safe_min, required_moles) / required_moles
 			for(var/adjustment in mole_adjustments)
 				mole_adjustments[adjustment] *= multiplier
 			if(alert_category)