Create Project Parameter with repeated parameter error checking

I am trying to create a graph that will create a Project Parameter text or number under Project Information. The problem I have is that every time I run my graph, it keeps adding new Project Parameters with the same name.

I would like to create a graph that will evaluate the project so that if there is an existing parameter with the same name, the graph doesn’t create it anymore. Some direction will be appreciate it.

I believe I figured it out thanks to this post: Parameter.CreateProjectParameter - #9 by Josh_Moore

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