Gymnastics question on giants =/?

i had my giant really good...then lost it ......then i got it back again for competition season......the reason i lost it i because at the handstand of the giant my hands slipped off the bar and i fell on the bar and split my chin open....it wasnt that bad....it was kinda funny cept 4 the part that i got hurt.....but i need 2 relearn them and i dont want to get hurt again like that .....im not scared but how do i prevent slipping off???