So I know max call stack error is appearing when infinite loop is in occurring, by recursion. But I'm having this weird problem. Everything in code under works fine, until I add these 2 commented lines under randomRow and randomCol. Is it possible to create infinite loop with random numbers or am I missing something?

function insertNumbers(freeRCPos, grid, fields, num) {
//base case
if (fields.length === 0) return grid;


let randomRow = Math.floor(Math.random() * maxRows);
let randomCol = Math.floor(Math.random() * maxRows);
// if (grid[randomRow][randomCol].value !== undefined)
//   return insertNumbers(freeRCPos, grid, fields, num);

let newFields = [];
//there are in total 9 fields so it has to go through all of them  
for (let field of fields) {
//check if its already in field
if (field.includes(JSON.stringify([randomRow, randomCol]))) {
  let res = freeRCPos.map((element: any) =>
    element.map((pos: any) =>
      pos === JSON.stringify([randomRow, randomCol]) ? true : false
    )
  );
  if (
    res.filter((el: any) => (el.includes(true) ? true : false)).length > 0
  ) {
    grid[randomRow][randomCol].value = num;
    newFields= fields.filter(
      (_: any, fieldId: number) => fields.indexOf(field) !== fieldId
    );
    //return with modified fields and others to be able to complete base case
    return insertNumbers(
      freeRCPos.map((field: any) =>
        field.map((pos: string) =>
          pos?.startsWith("[" + randomRow) || pos?.endsWith(randomCol + "]")
            ? null
            : pos
        )
      ),
      grid,
      newFields,
      num,
    );
  //else return same
  } else {
    return insertNumbers(freeRCPos, grid, fields, num);
  }
//else return same
} else {
  return insertNumbers(freeRCPos, grid, fields, num);
}
}
return grid;
}

I've maybe put a lot of unnecessary code here so if I need to shorten it, just ask. Appreciate the help.