Can I use the casadi::MX type in a logical conditions in an if-else statement?

[sm3304love]

hello. I want to apply different algorithms depending on the value of data of type casadi::MX.

My code is below.

casadi::MX distanceBetweenLSS(const LSS &lss1, const LSS &lss2)
    {
        using namespace casadi;
        MX dir1 = lss1.direction();
        MX dir2 = lss2.direction();

        MX crossProduct = MX::cross(dir1, dir2);

        MX normCrossProduct = MX::norm_2(crossProduct);

        if (normCrossProduct < MX(1e-8))
        {

            MX ab = lss2.startPoint - lss1.startPoint;
            MX proj = mtimes(dir1.T(), ab) * dir1 / MX::dot(dir1, dir1);

            MX distance = MX::norm_2(ab - proj);
            return distance;
        }
        else
        {
            MX ab = lss2.startPoint - lss1.startPoint;
            MX ab_T = ab.T();

            MX numerator = mtimes(ab_T, crossProduct);

            MX distance = (MX::abs(numerator) / normCrossProduct) - (lss1.radius + lss2.radius);

            return distance;
        }
    }

where if (normCrossProduct < MX(1e-8)) the following error occurs in this part:

 error: invalid user-defined conversion from ‘casadi::MX’ to ‘bool’ [-fpermissive]
   49 |         if (normCrossProduct < MX(1e-8))
      |             ~~~~~~~~~~~~~~~~~^~~~~~~~~~
In file included from /usr/local/include/casadi/core/core.hpp:44,
                 from /usr/local/include/casadi/casadi.hpp:29,
                 from /home/harco/roboe_ws/src/casADi_motion_planner/include/nmpc_motion_planner/collisions.hpp:2,
                 from /home/harco/roboe_ws/src/casADi_motion_planner/src/nmpc_planner.cpp:6:
/usr/local/include/casadi/core/mx.hpp:257:14: note: candidate is: ‘casadi::MX::operator double() const’ (near match)
  257 |     explicit operator double() const;
      |              ^~~~~~~~
/usr/local/include/casadi/core/mx.hpp:257:14: note:   return type ‘double’ of explicit conversion function cannot be converted to ‘bool’ with a qualification conversion

Can't I use casadi::MX type as logical conditions in a traditional if-else statement? If so, how should I solve my problem?