diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/bug973566.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/bug973566.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+Object.prototype[1] = 'peek';
+var g = newGlobal();
+var dbg = Debugger(g);
+dbg.onEnterFrame = function (frame) {
+    var lines = frame.script.getAllOffsets();
+};
+g.eval("1;");