diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-onStep-resumption-03.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-onStep-resumption-03.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+// If frame.onStep returns null, the debuggee terminates.
+
+var g = newGlobal();
+g.eval("function h() { debugger; }");
+
+var dbg = Debugger(g);
+var hits = 0;
+dbg.onDebuggerStatement = function (frame) {
+    hits++;
+    if (hits == 1) {
+        var rv = frame.eval("h();\n" +
+                            "throw 'fail';\n");
+        assertEq(rv, null);
+    } else {
+        frame.older.onStep = function () { return null; };
+    }
+};
+g.h();
+assertEq(hits, 2);