I started to have the same, not sure when:
2025-06-22 11:38:26.133 DEBUG (MainThread) [homeassistant.components.zwave_js] Add-on store info: {'detached': False, 'apparmor': 'default', 'auth_api': False, 'docker_api': False, 'full_access': False, 'homeassistant_api': False, 'host_network': False, 'host_pid': False, 'ingress': False, 'long_description': '# Home Assistant Add-on: Z-Wave JS\n\nAllow Home Assistant to talk to a Z-Wave Network via a USB Controller.\n\n![Supports aarch64 Architecture][aarch64-shield] ![Supports amd64 Architecture][amd64-shield] ![Supports armhf Architecture][armhf-shield] ![Supports armv7 Architecture][armv7-shield] ![Supports i386 Architecture][i386-shield]\n\n\n[aarch64-shield]: https://img.shields.io/badge/aarch64-yes-green.svg\n[amd64-shield]: https://img.shields.io/badge/amd64-yes-green.svg\n[armhf-shield]: https://img.shields.io/badge/armhf-yes-green.svg\n[armv7-shield]: https://img.shields.io/badge/armv7-yes-green.svg\n[i386-shield]: https://img.shields.io/badge/i386-yes-green.svg\n', 'rating': 6, 'signed': True, 'supervisor_api': True, 'supervisor_role': 'default', 'arch': ['amd64', 'i386', 'armhf', 'armv7', 'aarch64'], 'documentation': True, 'advanced': False, 'available': True, 'build': False, 'description': 'Control a Z-Wave network with Home Assistant Z-Wave JS', 'homeassistant': '2025.5.0', 'icon': True, 'logo': True, 'name': 'Z-Wave JS', 'repository': 'core', 'slug': 'core_zwave_js', 'stage': 'stable', 'update_available': False, 'url': 'https://github.com/home-assistant/addons/tree/master/zwave_js', 'version_latest': '0.16.0', 'version': '0.16.0', 'installed': True}
2025-06-22 11:38:26.137 ERROR (MainThread) [homeassistant.components.zwave_js] Failed to set the Z-Wave JS add-on options: not a valid value for dictionary value @ data['options']. Got {
'device': '/dev/serial/by-id/usb-Silicon_Labs_CP2102_USB_to_UART_Bridge_Controller_0001-if00-port0',
's0_legacy_key': 'REDACTED',
's2_access_control_key': 'REDACTED',
's2_authenticated_key': 'REDACTED',
's2_unauthenticated_key': 'REDACTED',
'lr_s2_access_control_key': 'REDACTED',
'lr_s2_authenticated_key': 'REDACTED'
}
I did check that all the REDACTED valued are valid HEX and no invalid char had crept in. In this worked find. All I did was apply a recent upgrade