Cant fully understand how to works array

Sorry, guys. But I cant understand why I constantly get a ReferenceError. Below a simple array code when you enter two digits in console.log shows numbers between them divided like % 2 .
But when I try to add capability of eliminate : null, ‘string’, and etc. it shows a ReferenceError by
arr.push(i);

for example

    for (let i = min; i <= max; i++){
    if (i % 4 == 0) {
      if (i === null) {
        alert('qwerty');
      }
    }
   }
      arr.push(i);
      return arr;
    };

This is original code. it works but without filter

let first = +prompt('Please enter first number:');
let second = +prompt('Please enter second number ');

function arrRange(min, max) {
  let arr = [];
  
  for (let i = min; i <= max; i++) 
    if (i % 2 == 0) 
   
  arr.push(i);
  return arr;
};

console.log(arrRange(first ,second ))

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