SongInfo: Use of uninitialized values

[RichieB2B]

Using LMS 8.3.0 I often see these errors:

Nov  9 09:09:56 nasty squeezeboxserver[867039]: [21-11-09 09:08:38.9816] Slim::Utils::Misc::msg (1341) Warning: [09:08:38.9812] Use of uninitialized value $moduleId in hash element at /var/lib/squeezeboxserver/cache/InstalledPlugins/Plugins/SongInfo/Plugin.pm line 334.
Nov  9 09:09:56 nasty squeezeboxserver[867039]: [21-11-09 09:08:38.9820] Slim::Utils::Misc::msg (1341) Warning: [09:08:38.9819] Use of uninitialized value $moduleId in concatenation (.) or string at /var/lib/squeezeboxserver/cache/InstalledPlugins/Plugins/SongInfo/Plugin.pm line 335.
Nov  9 09:09:56 nasty squeezeboxserver[867039]: [21-11-09 09:08:38.9821] Slim::Utils::Misc::msg (1341) Warning: [09:08:38.9821] Use of uninitialized value in concatenation (.) or string at /var/lib/squeezeboxserver/cache/InstalledPlugins/Plugins/SongInfo/Plugin.pm line 335.
Nov  9 09:09:56 nasty squeezeboxserver[867039]: [21-11-09 09:08:38.9832] Slim::Utils::Misc::msg (1341) Warning: [09:08:38.9832] Use of uninitialized value in string eq at /var/lib/squeezeboxserver/cache/InstalledPlugins/Plugins/SongInfo/Plugin.pm line 369.
Nov  9 09:09:56 nasty squeezeboxserver[867039]: [21-11-09 09:08:38.9833] Slim::Utils::Misc::msg (1341) Warning: [09:08:38.9833] Use of uninitialized value in string eq at /var/lib/squeezeboxserver/cache/InstalledPlugins/Plugins/SongInfo/Plugin.pm line 384.

How can objectInfoHandler be called without the $moduleId parameter?