Asserting predicates using Tau Prolog for Javascript

There, I've been trying this issue for over 2 days now and have got nothing to show for it. Therefore, would appreciate some help on this issue.

Issue: Attempting to assert a new predicate using Tau Prolog for Javascript returns a false result. The exact same query results in True when using SWI-Prolog.

The program is taken from a textarea in a HTML page. Everything is local on a single computer only.

**Prolog rules**
<textarea class="example-textinput example-program" id="program">
breads([parmesan, honeywheat]).
</textarea>

**Javascript in the same HTML page**
<script>
var session = pl.create();
var program = document.getElementById("program").value;
session.consult(program);
session.query(`asserta(chosen_meats(variable_to_be_asserted)).`);
session.answers(show())
function show() {
    // Return callback function
    return function (answer) {
        // Valid answer
        console.log(answer);
        if (pl.type.is_substitution(answer)) {
            // Get the value of the food
            var output = answer.lookup("X");
            console.log(output);
        }
    };
}
</script>

What I've attempted: Declaring dynamic predicates in Prolog. E.g

<textarea class="example-textinput example-program" id="program">
    breads([parmesan, honeywheat]).
    :- dynamic chosen_meats/1.
</textarea>

Changing to asserta, assertz and assert, when calling the query.

Result: In the callback function show(), false is always getting printed out whenever asserting is attempted.

Term {ref: 6065, id: "throw", args: Array(1), indicator: "throw/1"} is printed out whenever a query of chosen_meats(X). is done. However, normal predicate calling such as session.query("breads(X)."); gives the correct output at "[parmesan,honeywheat]", when tostring method is used.

Edit: Online Tau Prolog gives the same issue http://tau-prolog.org/ Error has been expanded as :

error parsing program: error(syntax_error('. or operator expected'), [line(1), column(11), found(client)])

for

:-dynamic client/1.

and

assertz(client(x)).