lg2 pull meets segment fault

At the beginning, lg2 works fine. After a few commit, pull, push operations, I tried to pull my github repo. it rise a segment fault, the newest files had been loaded but no commit log, all files were in modified state.
The log has showed below:

[~-l]$ lg2 pull
Fetching origin for repo 0x122aaf480
Host: [github.com](http://github.com/)
Public key hashes:
MD5: e5mBHkyRpQ1aLi6AEz8kyg==
SHA-1: M1irXdPjBsRhyED3SH6TtpfjBgA=
SHA-256: p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM=
There are 1 known hosts...
Host [github.com](http://github.com/) is in known_hosts!
SSH authentication: Using private key: /var/mobile/Containers/Data/Application/44C32D40-64B6-4D9B-9CD1-6B81D811C2EB/Documents/.ssh/id_rsa
remote: Enumerating objects: 53, done.
remote: Counting objects: 100% (53/53), done.
remote: Compressing objects: 100% (11/11), done.
remote: Total 29 (delta 16), reused 29 (delta 16), pack-reused 0 (from 0)
[updated] e697090325..132abed358 refs/remotes/origin/master
Received 29/29 objects in 14061 bytes (used 16 local objects)
segmentation fault