diff --git a/lnt/server/ui/static/lnt_profile.js b/lnt/server/ui/static/lnt_profile.js
--- a/lnt/server/ui/static/lnt_profile.js
+++ b/lnt/server/ui/static/lnt_profile.js
@@ -20,8 +20,8 @@
     this.noFallThru = gjt[0];
     this.weight = this.instructions
         .reduce(function (a,b) {
-            var weight_a = (a.weight === undefined)?a:a.weight;
-            var weight_b = (b.weight === undefined)?b:b.weight;
+            var weight_a = (a.weight === undefined)?0:a.weight;
+            var weight_b = (b.weight === undefined)?0:b.weight;
             return weight_a+weight_b;
         }, 0);
 };