I did a closer look to the source code (L_ALTUI.lua). The errors are thrown in some of the debug output calls. It is the string.format function that throws the message that one of parameters are null / nil. I commented the lines out. Now it works.
I will try the latest version from github the next days.
Agreed but it is hiding another issue. That input should not be null we need to understand the root cause of that to find the real issue behind. Can you say which line / function and variable was null ?
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