This PR should fix your issue: FIX: Do not break the whole app if color is invalid by pmusaraj · Pull Request #48 · discourse/discourse-tag-icons · GitHub
The issue was that you had some invalid color codes in your configuration (thanks for sharing it by the way):
rgba(0,0,0,1)is invalid#00BFFF\tis also invalid
After a recent update to the theme component, those invalid configurations were throwing errors. The update ensures that the theme component doesn’t break the whole site on invalid configuration, it will now not apply that specific color to the tag and log a warning in the console.