diff --git a/code/modules/organs/organ_internal.dm b/code/modules/organs/organ_internal.dm
index 232fa2bc0e0..a3b1d59fe42 100644
--- a/code/modules/organs/organ_internal.dm
+++ b/code/modules/organs/organ_internal.dm
@@ -63,6 +63,9 @@
 
 	process()
 		if(owner.life_tick % process_accuracy == 0)
+			if(src.damage < 0)
+				src.damage = 0
+
 			//High toxins levels are dangerous
 			if(owner.getToxLoss() >= 60 && !owner.reagents.has_reagent("anti_toxin"))
 				//Healthy liver suffers on its own
@@ -75,7 +78,7 @@
 					O.damage += 0.2  * process_accuracy
 
 			//Detox can heal small amounts of damage
-			if (owner.reagents.has_reagent("anti_toxin") && src.damage < src.min_bruised_damage)
+			if (src.damage && src.damage < src.min_bruised_damage && owner.reagents.has_reagent("anti_toxin"))
 				src.damage -= 0.2 * process_accuracy
 
 			// Damaged liver means some chemicals are very dangerous