Array index out of range on a Audio Visualizer

I have a "working" audio visualizer running, the white bars are jumping up and down to the music. But I'm getting constant Array index errors. Can anyone take a look at my code and try to help me out?

 using UnityEngine;
 using System.Collections;
 
 public class Spectrum : MonoBehaviour
 {
 
 
     public GameObject prefab;
     public float gridX = 5f;
     public float gridY = 5f;
     public float spacing = 2f;
 
     public int numberOfObjects = 20;
     public GameObject[] squares;
 
     void Start()
     {
         for (int y = 0; y < gridY; y++)
         {
             for (int x = -5; x < gridX; x++)
             {
                 Vector3 pos = new Vector3(x, 0, y) * spacing;
                 Instantiate(prefab, pos, Quaternion.identity);
             }
         }
 
         squares = GameObject.FindGameObjectsWithTag("Square");
 
     }
 
     void Update()
     {
         float[] spectrum = AudioListener.GetSpectrumData(1024, 0, FFTWindow.Hamming);
         for (int i = 0; 1 < numberOfObjects; i++)
         {
             Vector3 previousScale = squares[i].transform.localScale;
             previousScale.y = Mathf.Lerp(previousScale.y, spectrum[i] * 40, Time.deltaTime * 30);
             squares[i].transform.localScale = previousScale;
         }
     }
 
 }