List does not appear in ColinTreeListView

Guys, can anyone help me with this error here:

Explanation: when the user clicks, for example, on the name/image: “Hypertension - High Pressure” it will open the website with the theme in the web view.
Here are the blocks:

Database - Firebase

I discovered the error. This is in the variable that is receiving the value of the bucket variable. It is actually the key variable.

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