phpgraphlib dark image with php 8.2 -> error handeling

Question

I have worked multiple years with the PHP-Library chart generator. I have made hundreds of charts.

I have made the upgrade with my server to PHP8.2 and guess? The library doesn't want to work anymore.

Somebody brilliant to help me (us, I'm not alone)

I have tried hours to get the script working and also the error handling, but I can get only receiving a black screen.

Even tips of how I can receive error messages is a good help.

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I have changed a lot of the settings from false to true or inverse.

I have also tried to include the library directly on the example page but no different result and no error messages.

On the phpinfo page is the gd library working. I have basic script that work with the GD library

    protected $data_set_count = 0;
    protected $data_min = 0;
    protected $data_max = 0;
    protected $data_count = 0;
    protected $bool_data = false;
    protected $bool_bars_generate = true;
    protected $bool_all_negative = false;
    protected $bool_all_positive = false;
    protected $bool_gradient = false;
    protected $bool_user_data_range = false;
    protected $all_zero_data = false;
    protected $bool_gradient_colors_found = array();
    protected $bool_y_axis_setup = false;
    protected $bool_x_axis_setup = false;
    protected $x_axis_value_interval_counter = 0;