[Calculator] errors in console while typing.

[0oM4R]

if the user removed the current value to type a new one in balance field
it logs an error to console, and if the user moved to other fields this cause unwanted behavior.

Suggestion:
prevent calculating the price if the balance is not a valid value

[AlaaElattar]

Work In Progress :

• Found why this happens but still trying multiple solutions.

[khaledyoussef24]

verified on devnet
version : f530d72
console error no longer appears while typing.