NSCalendar components:fromDate:にnilを渡すと変なメッセージが

日付表示を作るのにNSCalendar components:fromDateを使ってたんですが、バグでfromDateにnilが入ったらしくコンソール出力に変なメッセージが…

簡単に起こすコードはこんな感じ

NSDateComponents *comps = [[NSCalendar currentCalendar] components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit |NSSecondCalendarUnit fromDate:nil];

コンソール出力

2014-03-23 17:13:47.523 ■■■[492:a0b] *** -[__NSCFCalendar components:fromDate:]: date cannot be nil
I mean really, what do you think that operation is supposed to mean with a nil date?
An exception has been avoided for now.
A few of these errors are going to be reported with this complaint, then further violations will simply silently do whatever random thing results from the nil.
Here is the backtrace where this occurred this time (some frames may be missing due to compiler optimizations):
(
    0   CoreFoundation                      0x02199475 -[__NSCFCalendar components:fromDate:] + 101
    1   CoreFoundation                      0x0223596c -[_NSCopyOnWriteCalendarWrapper components:fromDate:] + 92
// 略
)

2行目を意訳すると「もう一度聞きますが、貴方はなぜdateがnilでその処理ができると思ったんですか？」って感じですよね。
ただのユーモア的なやつっぽいですが、バグでnil渡っただけでなんでそこまで言われなきゃならないのか…。