diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/breakpoint-resume-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/breakpoint-resume-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+// A breakpoint handler hit method can return null to raise an uncatchable error.
+
+var g = newGlobal();
+var dbg = Debugger(g);
+dbg.onDebuggerStatement = function (frame) {
+    g.log += 'D';
+
+    function hit(frame) {
+        g.log += 'H';
+        return null;
+    }
+
+    var f = frame.eval("f").return;
+    var s = f.script;
+    var offs = s.getLineOffsets(g.line0 + 3);
+    for (var i = 0; i < offs.length; i++)
+        s.setBreakpoint(offs[i], {hit: hit});
+
+    var rv = f.call();
+    assertEq(rv, null);
+    g.log += 'X';
+};
+
+g.log = '';
+g.eval("line0 = Error().lineNumber;\n" +
+       "function f() {\n" +         // line0 + 1
+       "    try {\n" +              // line0 + 2
+       "        log += '3';\n" +    // line0 + 3
+       "    } catch (exc) {\n" +
+       "        log += '5';\n" +
+       "    }\n" +
+       "}\n" +
+       "debugger;\n");
+assertEq(g.log, 'DHX');