Bug code isnt working cant find error

errors:
Assets\pipespwanscript.cs(25,10): error CS8641: ‘else’ cannot start a statement
Assets\pipespwanscript.cs(25,10): error CS1003: Syntax error, ‘(‘ expected
Assets\pipespwanscript.cs(25,10): error CS1525: Invalid expression term ‘else’
Assets\pipespwanscript.cs(25,10): error CS1026: ) expected
Assets\pipespwanscript.cs(25,10): error CS1002: ; expected

code:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class pipespwanscript : MonoBehaviour
{
public GameObject pipe;
public float spawnRate = 2;
private float timer = 0;
public float heightOffset = 10;
// Start is called before the first frame update
void Start()
{
spawnPipe();
}
// Update is called once per frame
void Update()
{
if (timer < spawnRate) ;
{
timer = timer + Time.deltaTime;
}
else
{
spawnPipe(false);
timer = 0;
}
}
void spawnPipe()
{
float lowestPoint = transform.position.y - heightOffset;
float highestPoint = transform.position.y + heightOffset;
Instantiate(pipe, new Vector3(transform.position.x, Random.Range(lowestPoint, highestPoint), 0) , transform.rotation);
}
}