fixed a bug that caused apps crash.
fixed a bug that caused apps crash.

If you do not use `detectionBlock`, click on the link will cause the app crash.
HackRoy/STTweetLabel,quanquan1986/STTweetLabel,bespider/STTweetLabel,pankkor/STTweetLabel,SebastienThiebaud/STTweetLabel,pabelnl/STTweetLabel