Getting an error that my tf has been ignored

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I have Bosch BN055 9-axis accelerometer and I have installed this package to integrate with ROS: LINK

However, when I run the whole launch file with odometry (odometry gets the IMU values from /imu topic, will put the code at the end), I get this error:

Error:   TF_DENORMALIZED_QUATERNION: Ignoring transform for child_frame_id "base_footprint" from authority "unknown_publisher" because of an invalid quaternion in the transform (0.000000 0.000000 0.008824 -0.994081)

And here is the code where odometry gets the IMU orientation values (callback function):

void Odometry::ImuCb(const sensor_msgs::Imu::ConstPtr& data)
{
    orient_z = data->orientation.z;
    orient_w = data->orientation.w;

}

And here where it puts into tf message:

geometry_msgs::Quaternion odom_quat ;



    odom_quat.x = 0.0;
    odom_quat.y = 0.0;
    odom_quat.z = 0.0;

    odom_quat.z = this->orient_z;
    odom_quat.w = this->orient_w;

    geometry_msgs::TransformStamped odom_trans;
    odom_trans.header.stamp = now;
    odom_trans.header.frame_id = "odom";
    odom_trans.child_frame_id = "base_footprint";

        odom_trans.transform.translation.x = x_final;
        odom_trans.transform.translation.y = y_final;
        odom_trans.transform.translation.z = 0.0;
        odom_trans.transform.rotation = odom_quat;

        odom_broadcaster.sendTransform(odom_trans);