Will application crash if FileInputStream is not closed?

I have used FileInputStream to read .jks file in my web application. Unfortunately, i forgot to close the stream in the code and it is moved to production. FileInputStream is not a static stream, but a local variable.

I will get a good chance to fix this in one month or two month.

Meanwhile, will there be any chance my application will crash because of this mistake.? Do i need to move the fix very soon or it can wait two months.

Kindly suggest me.