diff --git a/src/js/DefaultRules.js b/src/js/DefaultRules.js
index ee47a4d38935ea2414f70ad9d5b25c9b98db74ef..75ea237c1fc85b4157fba08aa86551721d8fbe31 100644
--- a/src/js/DefaultRules.js
+++ b/src/js/DefaultRules.js
@@ -1288,6 +1288,7 @@ window.DefaultRules = (function() {
 					if (a.weight < b.weight) {
 						return 1;
 					}
+					return 0;
 				});
 				if (slave.drugs !== _priorities[0].drug) {
 					slave.drugs = _priorities[0].drug;