diff --git a/src/js/DefaultRules.js b/src/js/DefaultRules.js
index 3ac26a8878ef534bacef8345f323002d6ddcc0e5..5f3a008df380030b9430ca24d13419d52c59550a 100644
--- a/src/js/DefaultRules.js
+++ b/src/js/DefaultRules.js
@@ -1297,7 +1297,8 @@ window.DefaultRules = (function() {
 					} else {
 						r += `${slave.drugs}, since `;
 					}
-					r += `that part of ${his} body is ${Math.trunc(_priorities[0].weight*100)}% `;
+					r += `that part of ${his} body is `;
+					if (!isNaN(_priorities[0].weight)) r += `${Math.trunc(_priorities[0].weight*100)}% ` 
 					if (_priorities[0].weight < 1) r+= "below ";
 					else r+= "above ";
 					r += "the targeted size.";