Blood vomit and failsafe (#17792)

code/modules/organs/blood.dm

@@ -422,6 +422,11 @@ var/const/CE_STABLE_THRESHOLD = 0.5
 		if(M.isSynthetic()) synth = 1
 		source = M.get_blood(M.vessel)
 
+	//Someone fed us a weird source. Let's log it.
+	if(source && !istype(source, /datum/reagent/blood))
+		log_debug("A blood splatter was made using non-blood datum [source]!")
+		source = null //Clear the source since it's invalid. Fallback to non-source behavior.
+
 	// Are we dripping or splattering?
 	var/list/drips = list()
 	// Only a certain number of drips (or one large splatter) can be on a given turf.