There is a notice on every website page, while debugger is enabled. The notice is only visible in "System Log", because it happens during debugger initialization and before Debugger sets it's error handlers:
Problem happens, because there is not "path" component in "
phpstorm://open?file=%F&line=%L" URL, that debugger is using for building links to edit files mentioned in debugger report.
Check if "path" component found in "Debugger::parseEditorUrl" method before attempting to use it.