Program crash with a certain input for `balance` command

[nus-se-script]

The program crashed after I input balanced Linh###.

---

_{[original: nus-cs2113-AY2324S2/pe-interim#1116] [original labels: type.FunctionalityBug severity.High]}

[hafizuddin-a]

Team's Response

Insufficient detail provided. Created dummy group group3. Added 2 dummy member Linh### and member2. Added test expenses. Able to show the balance of Linh###.

Duplicate status (if any):

--