One time error after execution

Hello fellow KNIME’ists,

when im executing the top rightmost view node (the selected node) in the workflow below, the tree gets executed inclusive the view node (all green). Then, double clicking on the view node triggers the (error) state you can see in the screenshot.

There is a popup in the bottom left: Error (root:46) and errors ‘backpropagation’ until the Query Python nodes. It states that some triggered execution failed but until i want to open the view node, every node is showing green lights.

I can solve this problem by re-executing the view node a second time and then double clicking it to open it.

This is somehow a solved issue but its annoying, can you help me with this error?

Thanks in advance

Chris