Add shaders into Array based on Material Array

Basically, I need to catalogue all the shaders I'm using for some objects which use multiple materials, and this didn't save the shaders. What am I doing wrong??? ChildInf is an array that holds object, renderer, material[] and shader[].

 void SetShaders()
     {
 
         for (int i = 0; i < childInf.Length; i++)
         {
             childInf[i].render = childInf[i].childObj.GetComponent<SkinnedMeshRenderer>();
                 childInf[i].mats = childInf[i].render.materials;
                 for (int s = 0; s < childInf[i].mats.Length; s++)
                     childInf[i].shadersforMats[s] = childInf[i].mats[s].shader;
                 // we saved all of our original shaders
 
         }
             Debug.Log("Shaders set");
 
     }

Everything up until this line childInf[i].shadersforMats[s] = childInf[i].mats[s].shader; works just fine.