diff --git a/code/modules/forensics/forensics_helpers.dm b/code/modules/forensics/forensics_helpers.dm
index 5b32ee43418..3d7fab59925 100644
--- a/code/modules/forensics/forensics_helpers.dm
+++ b/code/modules/forensics/forensics_helpers.dm
@@ -112,7 +112,7 @@
 	if (QDELETED(src))
 		return
 	. = ..()
-	if (isnull(blood_DNA_to_add))
+	if (isnull(blood_DNA_to_add) || !length(blood_DNA_to_add))
 		return .
 	if (!islist(blood_DNA_to_add))
 		CRASH("add_blood_DNA on [src] ([type]) has been passed a non-list blood_DNA_to_add ([blood_DNA_to_add])!")
diff --git a/code/modules/reagents/reagent_containers/rag.dm b/code/modules/reagents/reagent_containers/rag.dm
index bd73f20fe1f..70aa4c23b79 100644
--- a/code/modules/reagents/reagent_containers/rag.dm
+++ b/code/modules/reagents/reagent_containers/rag.dm
@@ -145,7 +145,8 @@
 			fire_act(500, 100)
 
 	// FINALLY add the dna to us
-	add_blood_DNA(all_blood_dna)
+	if(length(all_blood_dna))
+		add_blood_DNA(all_blood_dna)
 	update_appearance()
 	if(blood_level >= 10)
 		to_chat(cleaner, span_warning("[src] is too dirty to clean anything else! Wash it first!"))