OverlapSphereNonAlloc returns all colliders null some frames and others not with SteamVR hand hover

I realized using Steamvr hover material appeared intermittently when hand approached the object with the interactable component and i realized that it was cause OverlapSphereNonAlloc some frames returns all colliders values as null but other frames gives the right result, any ideas?

This is the code

Code (CSharp):

1.  
2.         protected virtual bool CheckHoveringForTransform(Vector3 hoverPosition, float hoverRadius, ref float closestDistance, ref Interactable closestInteractable, Color debugColor)
3.         {
4.             bool foundCloser = false;
5.  
6.             // null out old vals
7.             for (int i = 0; i < overlappingColliders.Length; ++i)
8.             {
9.                 overlappingColliders[i] = null;
10.             }
11.  
12.             int numColliding = Physics.OverlapSphereNonAlloc(hoverPosition, hoverRadius, overlappingColliders, hoverLayerMask.value);
13.  
14.             // DebugVar
15.             int iActualColliderCount = 0;
16.  
17.             // Pick the closest hovering
18.             for (int colliderIndex = 0; colliderIndex < overlappingColliders.Length; colliderIndex++)
19.             {
20.                 Collider collider = overlappingColliders[colliderIndex];
21.  
22.                 if (collider == null)
23.                 {
24.                     continue;
25.                 }
26.  
27.                 // Yeah, it's null, skip
28.                 if (collider.GetComponent<Interactable>() == null)
29.                 {
30.                     continue;
31.                 }
32.                 Interactable contacting = collider.GetComponent<Interactable>();
33.  
34.                 // Best candidate so far...
35.                 float distance = Vector3.Distance(contacting.transform.position, hoverPosition);
36.                 bool isCloser = (distance < closestDistance);
37.                 bool lowerPriority = false;
38.                 if (closestInteractable != null)
39.                 { // compare to closest interactable to check priority
40.                     lowerPriority = contacting.hoverPriority < closestInteractable.hoverPriority;
41.                     //if (contacting.name == closestInteractable.name) isCloser = true;
42.                 }
43.                 if (isCloser && !lowerPriority)
44.                 {
45.                     closestDistance = distance;
46.                     closestInteractable = contacting;
47.                     foundCloser = true;
48.                 }
49.                 iActualColliderCount++;
50.             }
51. }