diff --git a/code/datums/diseases/transformation.dm b/code/datums/diseases/transformation.dm
index 63c44cfa29b..baa400b8172 100644
--- a/code/datums/diseases/transformation.dm
+++ b/code/datums/diseases/transformation.dm
@@ -37,16 +37,16 @@
 
 	switch(stage)
 		if(1)
-			if (stage1 && DT_PROB(stage_prob, delta_time))
+			if (length(stage1) && DT_PROB(stage_prob, delta_time))
 				to_chat(affected_mob, pick(stage1))
 		if(2)
-			if (stage2 && DT_PROB(stage_prob, delta_time))
+			if (length(stage2) && DT_PROB(stage_prob, delta_time))
 				to_chat(affected_mob, pick(stage2))
 		if(3)
-			if (stage3 && DT_PROB(stage_prob * 2, delta_time))
+			if (length(stage3) && DT_PROB(stage_prob * 2, delta_time))
 				to_chat(affected_mob, pick(stage3))
 		if(4)
-			if (stage4 && DT_PROB(stage_prob * 2, delta_time))
+			if (length(stage4) && DT_PROB(stage_prob * 2, delta_time))
 				to_chat(affected_mob, pick(stage4))
 		if(5)
 			do_disease_transformation(affected_mob)
@@ -54,7 +54,7 @@
 
 /datum/disease/transformation/proc/do_disease_transformation(mob/living/affected_mob)
 	if(istype(affected_mob, /mob/living/carbon) && affected_mob.stat != DEAD)
-		if(stage5)
+		if(length(stage5))
 			to_chat(affected_mob, pick(stage5))
 		if(QDELETED(affected_mob))
 			return