diff --git a/code/datums/diseases/_disease.dm b/code/datums/diseases/_disease.dm
index 6b7c2d89606..d099da71bf9 100644
--- a/code/datums/diseases/_disease.dm
+++ b/code/datums/diseases/_disease.dm
@@ -75,7 +75,7 @@ GLOBAL_LIST_INIT(diseases, subtypesof(/datum/disease))
 	var/cure = has_cure()
 
 	if(carrier && !cure)
-		return
+		return TRUE
 
 	stage = min(stage, max_stages)
 
@@ -89,6 +89,8 @@ GLOBAL_LIST_INIT(diseases, subtypesof(/datum/disease))
 	if(disease_flags & CURABLE)
 		if(cure && prob(cure_chance))
 			cure()
+			return FALSE
+	return TRUE
 
 
 /datum/disease/proc/has_cure()
diff --git a/code/datums/diseases/advance/advance.dm b/code/datums/diseases/advance/advance.dm
index 318dd176e45..f167df70dac 100644
--- a/code/datums/diseases/advance/advance.dm
+++ b/code/datums/diseases/advance/advance.dm
@@ -69,7 +69,8 @@ GLOBAL_LIST_INIT(advance_cures, list(
 
 // Randomly pick a symptom to activate.
 /datum/disease/advance/stage_act()
-	..()
+	if(!..())
+		return FALSE
 	if(symptoms && symptoms.len)
 
 		if(!processing)
@@ -81,6 +82,7 @@ GLOBAL_LIST_INIT(advance_cures, list(
 			S.Activate(src)
 	else
 		CRASH("We do not have any symptoms during stage_act()!")
+	return TRUE
 
 // Compares type then ID.
 /datum/disease/advance/IsSame(datum/disease/advance/D)