1 files changed, 3 insertions, 1 deletions
diff --git a/lib/_debugger.js b/lib/_debugger.js
index 2613d8bbbe..4dd9f53633 100644
--- a/lib/_debugger.js
+++ b/lib/_debugger.js
@@ -1367,7 +1367,9 @@ Interface.prototype.setBreakpoint = function(script, line,
     if (script != +script && !this.client.scripts[script]) {
       var scripts = this.client.scripts;
       Object.keys(scripts).forEach(function(id) {
-        if (scripts[id] && scripts[id].name.indexOf(script) !== -1) {
+        if (scripts[id] &&
+            scripts[id].name &&
+            scripts[id].name.indexOf(script) !== -1) {
           if (scriptId) {
             ambiguous = true;
           }