NullReferenceException Error

So this is the deal. I have no error in the editor and everything is running smoothly. However when i run my build a script doesn't work. I checked the output log and i saw this message:

NullReferenceException: Object reference not set to an instance of an object at Matrix_Node_Row.updateCurveData (UnityEngine.AnimationCurve curveData) [0x00000] in :0

at Matrix_Node_Row.Update () [0x00000] in :0

(Filename: Line: -1)

So i went to the Matrix_Node_Row Class and checked the updateCurveData function. Here it is:

     public void updateCurveData(AnimationCurve curveData){
         if (curveData==null)
         {
             Debug.Log ("object "+this.ToString()+"is trying to run a null curveData");
         }
         if (this.curveData!=null || animateEnabled==true)
         {
 
             for (int i=0; i<row.Length; i++) {
                 row[i].inputCurveData (curveData.Evaluate ((i*step)+p_offset));
             }
         }
     }
     public void updateCurveData(float curveData)
     {
         if (curveData==null)
         {
             Debug.Log ("object "+this.ToString()+"is trying to run a null curveData");
         }
             if (this.curveData!=null || animateEnabled==true)
             {
                 for (int i=0; i<row.Length; i++) {
                     row[i].inputCurveData (curveData);
                 }
             }
     }

The Update function looks like this:

 if (animateEnabled)
         {
             updateCurveData (curveData);
             //updateColorData (colorData);
         }

The debug meassage is not written to the log so curveData can't be null. I don't understand where something like this can stem from and i need to present my work tommorow!!