Set transform for streaming level null problem

Hello, i have a question, only sometimes my set transform for the created instance of the streaming level result in a null and isn’t created, the fact is that it appears to be completely random, sometimes fails 2 times and sometimes 4, sometimes doesn’t fail at all.

The node is this, basically i have an array of levels, i take the names in a random order due to a random integer and i return the value in the get streaming level, from them, it creates the level instance and set the transform.

The first for loop in the +x Axis works always great, the second one in the -x axis miss often some level, in a for loop of 0 - 6.

Here the node image: