MySQL update query in Wordpress plugin not working

I am developing a wordpress plugin but I am facing a problem. I would like to update an existing value of a table in a MySQL database. After some research, I saw that you can use this method:

global $wpdb;
$wpdb->query($wpdb->prepare("UPDATE myTable SET name=$name WHERE id=$idTable"));

However when I run my code, I get this error in the javascript console:

Uncaught Error: Call to a member function query() on null

Do you have an idea how to solve this problem ?

source https://stackoverflow.com/questions/70137262/mysql-update-query-in-wordpress-plugin-not-working

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