Issues creating proper level-unlocking script

I'm creating a level unlocking script based on the MenuLevelLock script used in James Arndt's YT tutorial series. I've already converted his base MenuLevelLock from Javascript to C#; however, I'm trying to make the script more user-friendly within the Unity editor by creating arrays for all the public variables he set up before. Here are all of the public arrays I've set up (w/ comments included):

 public GUITexture[] levelsUnlocked; //for displaying icons for unlocked levels
 public GUITexture[] levelsLocked;   //for displaying icons for locked levels
 public GameObject[] levelColliders; //for selecting unlocked levels w/ mouse
 public int[] levelsComplete;        //PlayerPref values for deciding which levels have been complete
 public string[] levelKeys;          //PlayerPref keys for deciding which levels are unlocked

With the below function, I'm trying to set the levels active or inactive based on their levelsComplete value:

 void SetLockedAndUnlockedLevels() {
         foreach (int levComplete in levelsComplete)
         {
             foreach (GameObject levCollider in levelColliders)
             {
                 if (levComplete != 0)
                 {
                     levCollider.SetActive(true);
                 }
                 else
                 {
                     levCollider.SetActive(false);
                 }
             }
             foreach (GUITexture levUnlocked in levelsUnlocked)
             {
                 if (levComplete != 0)
                     levUnlocked.enabled = true;
                 else
                     levUnlocked.enabled = false;
             }
             foreach (GUITexture levLocked in levelsLocked)
             {
                 if (levComplete != 0)
                     levLocked.enabled = false;
                 else
                     levLocked.enabled = true;
             }
         }
     }

Unfortunately, every time I run this code, Unity locks up forcing me to quit the program.

Given the above code, what am I doing wrong that's making Unity to lock up?