Uncaught TypeError: visited[year][(month + 1)] is undefined
    <anonymous> debugger eval code:49
    jQuery 7
        i
        fireWith
        y
        c
        send
        ajax
        b
    <anonymous> debugger eval code:20
debugger eval code:49:13
    <anonymous> debugger eval code:49
    jQuery 7
        i
        fireWith
        y
        c
        (Asynchronous: EventHandlerNonNull)
    send
        ajax
        b
    <anonymous> debugger eval code:20
    getEvalResult resource://devtools/server/actors/webconsole/eval-with-debugger.js:243
    evalWithDebugger resource://devtools/server/actors/webconsole/eval-with-debugger.js:167
    evaluateJS resource://devtools/server/actors/webconsole.js:1120
    evaluateJSAsync resource://devtools/server/actors/webconsole.js:1012
    makeInfallible resource://devtools/shared/ThreadSafeDevToolsUtils.js:103