The sign "backslash" only escapes the question mark (mysql it extends to any character). But the main thing is that the equal sign in the query is incorrect, in my case, using LIKE operator, I get a non-empty result set, and the use of "=" the empty result set is empty. And searching by the messages on the forum I am not alone in facing the situation "Assign the component VirtueMart to a menu item" and non-working router. Try this by phpMyAdmin with only one language (without the lang "*")