diff --git a/code/modules/chemical/Chemistry-Reagents.dm b/code/modules/chemical/Chemistry-Reagents.dm
index b13b30ecc2..8bce8cc24c 100644
--- a/code/modules/chemical/Chemistry-Reagents.dm
+++ b/code/modules/chemical/Chemistry-Reagents.dm
@@ -812,6 +812,7 @@ datum
 
 			reaction_mob(var/mob/M, var/method=TOUCH, var/volume)
 				if(!..())	return
+				if(isrobot(M) || isAI(M)) return // Mutagen doesn't do anything to robutts!
 				src = null
 				if((method==TOUCH && prob(33)) || method==INGEST)
 					randmuti(M)
@@ -823,6 +824,7 @@ datum
 					updateappearance(M,M.dna.uni_identity)
 				return
 			on_mob_life(var/mob/living/M as mob)
+				if(isrobot(M) || isAI(M)) return // Mutagen doesn't do anything to robutts!
 				if(!M) M = holder.my_atom
 				M.radiation += 3
 				..()