LinQ adding unwanted (@__term_0 LIKE N'') to SQL queries

Question

I have an IQueryable extension in my User model where I'm using LINQKit :

public static IQueryable<User> ApplyFilterTerms(this IQueryable<User> query, string search)
{
    if (string.IsNullOrWhiteSpace(search)) 
        return query;

    var searchTerms = search.Split(' ').Where(x => x.Length > 0).ToArray();

    if (!searchTerms.Any()) 
        return query;

    var termsPredicate = searchTerms.Aggregate(
        LinqExtensions.True<User>(),
        (current, term) => current.And(
            LinqExtensions.False<User>()
                .Or(x => x.FirstName.Contains(term))
                .Or(x => x.LastName.Contains(term))
                .Or(x => x.UserName.Contains(term))
        ));

    return query.Where(termsPredicate);
}

When executing this db query, LinQ translates it into something in this pattern:

DECLARE @__term_0 AS VARCHAR(100) = 'jonh'

SELECT [u].[UserId], [u].[FirstName], [u].[LastName], [u].[UserName]
FROM [Users] AS [u]
WHERE (((@__term_0 LIKE N'') OR (CHARINDEX(@__term_0, [u].[FirstName]) > 0))
   OR ((@__term_0 LIKE N'') OR (CHARINDEX(@__term_0, [u].[LastName]) > 0)))
   OR ((@__term_0 LIKE N'') OR (CHARINDEX(@__term_0, [u].[UserName]) > 0))
ORDER BY [u].[FirstName], [u].[LastName]

Would there be a way to remove this apparently useless (@__term_0 LIKE N'') that linq adds to the query?