If statement is keep on repeating itself

I have implement an if statement in my Java android studio code. During runtime it keeps on repeating again and again. I have used System.exit(0); but it stops the running code. How can I prevent the if statement from repeating?

mrRef.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        if (dataSnapshot.exists()) {

            Map<String, Object> map = (Map<String, Object>) dataSnapshot.getValue();


            String balances = (String) map.get("amount");
            String ibalances = (String) map.get("investment");
            String fbalances = (String) map.get("fradxcoin");


            int countss = Math.round(Float.parseFloat(balances));
 
            float ballss = (float) (countss + (ballsbi));

            String strAmounts = String.valueOf(ballss);                                        


            Names names = new Names(idpp, strAmounts, ibalances, fbalances);

            rdatabaseReference.child(idpp).child("balance").setValue(names);

        } else {
        }
    }
    @Override
    public void onCancelled(DatabaseError databaseError) {
    }
});