Groups keep crashing

[luckylifo]

I was trying to add a 3rd group called 'Friends' today under the people section. However, the people app keeps crashing! I was somehow able to add the group after 10-15 trials. Now it keeps crashing whenever I try to add someone to the group. So I have to try 10-15 times to add the each person to the group :/

Here's what I've tried so far:

1) Renaming the group
2) Turning off wifi

Any other ideas?