Reason for getting null value in facebook feed post.

[Senthil Ganesan]

friend's
I'm working upon facebook application to post feed from device,i have share option in my title bar of my application,some times the facebook feed post appears in the screen has getting blank content without the title,and description,again when i click share option on next time the feed content is available,what the reason for getting null at first click is't my problem or facebook issue.

help me

thanks in advance.