You will have to narrow it down a lot. I don't see an SQL node there, so where is the query being done? Which are the relevant nodes here? Which Debug message is coming from which Debug node?
Your screenshot of the Debug sidebar now has two different messages - one of which is a number and one is an array. My guess is you are passing the message which is just a number to the Change node - which is why it doesn't work.
But until you explain your flow and highlight the relevant parts to us, its impossible for us to help.
