The issue is you’re creating a function that returns values based on classes that may or may not exist. Currently, if all your valid checks fail, the function is still required to return a bool value based on values that are derived from an object that doesn’t exist. You can fix it by adding in local variables and only returning their resulting information. These local values are defaulted to false and will only return to true if your evaluation passes. Now, this exact node graph may not be what you want to do depending on your usecase but this will stop your issue.
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