Tutorial 6 on macOS: 'G_IS_VALUE (value)' failed

Created by: kornelski

cargo run --bin basic-tutorial-6

Pad Template for Audio test source: SRC template: 'src' Availability: Always Capabilities: audio/x-raw

(process:78002): GLib-GObject-CRITICAL **: g_strdup_value_contents: assertion 'G_IS_VALUE (value)' failed thread 'main' panicked at 'assertion failed: !ptr.is_null()', /Users/porneL/.cargo/git/checkouts/glib-928cf7b282977403/4356d43/src/translate.rs:872:8

Backtrace points to src/bin/basic-tutorial-6.rs:20

        for (field, value) in structure.iter() {
            println!("{}  {}:{:?}", prefix, field, value);
        }