Error when creating a table in phpmyadmin

[tibod]

Hello,

I want to add a database to my website.
I connect to Phpmyadmin via XAMPP (for MAc, version 5.6.15)

I manage to create my database but impossible to save a table. Ma database is empty.
I have a pop up error message:

"from://localhost: Please enter a valid length"

My concern is I did not specify any length for my columns in my table. So I do not know where it comes from.
I checked on Google but I did not find any support.

Any idea? Have you faced the same issue?

Thank you
tibo