diff --git a/code/WorkInProgress/cloning.dm b/code/WorkInProgress/cloning.dm
index cf8590606a1..c4f6525768f 100644
--- a/code/WorkInProgress/cloning.dm
+++ b/code/WorkInProgress/cloning.dm
@@ -309,9 +309,12 @@
 	return
 
 /obj/machinery/computer/cloning/proc/scan_mob(mob/living/carbon/human/subject as mob)
-	if ((isnull(subject)) || (!istype(subject, /mob/living/carbon/human)) || (!subject.dna))
+	if ((isnull(subject)) || (!(istype(subject, /mob/living/carbon/human))) || (!subject.dna))
 		src.temp = "Error: Unable to locate valid genetic data."
 		return
+	if (subject.brain_op_stage == 4.0)
+		src.temp = "Error: No signs of intelligence detected."
+		return
 	if ((!subject.ckey) || (!subject.client))
 		src.temp = "Error: Mental interface failure."
 		return