diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/bug-725733.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/bug-725733.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+// |jit-test|
+// Adding a debuggee must leave its scripts in a safe state.
+
+var g = newGlobal();
+g.eval(
+    "function f(x) { return {q: x}; }\n" +
+    "var n = f('').q;\n");
+var dbg = new Debugger(g);
+g.eval("f(0)");