How to avoid modal popup message(s)?

In a program I frequently read from the clipboard, but some times a modal popup message occurs: "Cannot open clipboard". How can I avoid this? It is not crucial for my program; I can go on without having accessed the clipboard, but it is indeed crucial for the program NOT to stop and require a click on the "OK" button. Is there a way to avoid any of these messages? (And what do I do wrong when attempting to access the clipboard?)
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just put the code inside a try..except end

//code to access the clipboard here
//do nothing, you don't care about errors
//you may return false or do something else here
uses Clipbrd;

procedure TForm1.Button1Click(Sender: TObject);
    if not (Trim(Clipboard.AsText) = '') then
        // your clipboard is not empty


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