Attempting to send video on WhatsApp causes crash
Looking through your log I noticed a library called Unflod.dylib.

This is malware. You might want to remove it ASAP.

http://nakedsecurity.sophos.com/2014/04/21/new-ios-malware-with-a-funky-name-unflod-baby-panda/

Users on Reddit are suggesting it grabs your Apple ID and password and sends it to a server in China. So you might want to reset the password for your Apple ID too.

http://www.reddit.com/r/jailbreak/comments/23bdwr/beware_unfloddylib_sends_apple_id_and_password_to/

BTW At least one user on Reddit says it made their WhatsApp crash too. So removing this might stop the WhatsApp crashes.
http://www.reddit.com/r/jailbreak/comments/23b7qs/what_is_unflod_its_a_mobile_substrate_addon_that/cgve5aq