Array values not being initialised unless the object with the (Player) script is selected in the inspector whilst the game is on

... Otherwise, you just get a "NullReferenceException: Object reference not set to an instance of an object"

Full error: "NullReferenceException: Object reference not set to an instance of an object Player.SetRelationship (Int32 currentLog, System.String npcLabel) (at Assets/Scripts/Player.js:52) SpeakMod.Update () (at Assets/Scripts/SpeakMod.js:76)"

The code: (Player.js)

 var movementSpeed : float = 1;
 var canMove : boolean = true;
 var numOfNPCs : int;
 
 
 public class Relationship
 {
     var log : int;
     var npc : String;
     
     function Relationship(log : int, npc : String)
     {
         this.log = log;
         this.npc = npc;
     }
 }
 var relationships : Relationship[];
 private var tempNum : int;
 
 function Start()
 {
     relationships = new Relationship[numOfNPCs];
 }
 
 function FixedUpdate () {
     if(canMove)
     {
         if(Input.GetKey(KeyCode.A))//-MOVEMENT--------------
         {
             transform.position.x -= movementSpeed * 0.1;
         }else if(Input.GetKey(KeyCode.D)){
             transform.position.x += movementSpeed * 0.1;
         }
 
         if(Input.GetKey(KeyCode.S))
         {
             transform.position.y -= movementSpeed * 0.1;
         }else if(Input.GetKey(KeyCode.W)){
             transform.position.y += movementSpeed * 0.1;
         }//-MOVEMENT-----------------------------------------
     }
 }
 
 function SetRelationship(currentLog : int, npcLabel : String)
 {        
     for(var x = 0; x < relationships.length; x++)
     {
         if(relationships[x].npc == npcLabel)
         {
             relationships[x].log = currentLog;
             return;
         }
     }
     var newRelationship = new Relationship(currentLog, npcLabel); 
     relationships[tempNum] = newRelationship;
     tempNum++;
 }

(SpeakMod)(the part that matters)-------------------------------------------------------

 function Update()
 {
     if(Input.GetKeyUp(KeyCode.Space) && triggered)
     {    
         askee.GetComponentInParent(Player).canMove = false;
         speechWindow.SetActive(true);
 
         
         if(logs[logCounter].conditions.name && askee.GetComponentInChildren(Name).gameObject.GetComponent(TextMesh).text == 
         logs[logCounter].conditions.requiredName) logs[logCounter].conditions.name = false;
         
         
         if(logs[logCounter].conditions.speakWithXAboutY)
         {
         
             for(var i = 0; i < askee.GetComponentInParent(Player).relationships.length; i++)
             {
                 if(logs[logCounter].conditions.withX.GetComponent(SpeakMod).myLabel == askee.GetComponentInParent(Player).relationships[i].npc &&
                 logs[logCounter].conditions.aboutY_Log == askee.GetComponentInParent(Player).relationships[i].log) logs[logCounter].conditions.speakWithXAboutY = true;
             }
         }
         
         
 
         if(!logs[logCounter].conditions.name && !logs[logCounter].conditions.item 
         && !logs[logCounter].conditions.speakWithXAboutY && !logs[logCounter].conditions.noConditions) logs[logCounter].conditions.conditionsMet = true;
         
         if(pageCounter == logs[logCounter].pages.length - 1)
         {
             askee.GetComponentInParent(Player).SetRelationship(logCounter, myLabel);

The lines in questions are:

Player.js:52 "relationships[x].log = currentLog;"

and

SpeakMod.js:76 "askee.GetComponentInParent(Player).SetRelationship(logCounter, myLabel);"

I've never encountered this kind of bug - no idea how to fix it. :/

Thanks in advance, ~Donatas.