If it’s a commercial plugin, this is likely to be a bug in JUCE and it would be helpful to know which plugin causes the failure so that we can fix the framework.
If the crash happens while scanning a plugin that you wrote yourself, that would likely indicate a bug in that plugin. In this case, you’ll need to either debug the plugin (people on this forum may be able to help if you provide some more details) or remove it from /Library/Audio/Plug-Ins/VST3.
It should be possible to drag the line next to the “Name” column-header to make the column wider. Then it should be possible to read the full path to the plugin.