diff --git a/lib/commands/list.js b/lib/commands/list.js
index c010de86..963284a3 100644
--- a/lib/commands/list.js
+++ b/lib/commands/list.js
@@ -73,7 +73,7 @@ cmd.handler = function(argv) {
           problem.fid,
           problem.name,
           h.prettyLevel(problem.level),
-          problem.percent.toFixed(2));
+          (problem.percent || 0).toFixed(2));
 
       if (argv.extra) {
         let badges = [problem.category];