It quite often happens that the stem splits, branches kink etc. Normally ist no big Thing.You can use duck tape, pipecleners, anything to help the plant .
in naturee stems and branches are kinking and Breaking to. Most time the plant repairs the Damage by ist own. In your case, i wont do anything, ( if one of the 2 branches is damaged. just pay Attention tot to breeak it complete. it will be " helaed in a week.
after it is healed you can bind some pipecleneraround the middle stem .at the base of theY ( under the "Little arms of the Y)