Blindly attempt to fix #716

This is becoming another snowball of hacks...

CHANGELOG.md

@@ -12,6 +12,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - **New icons:** Tipe (`.tipe`), Workbox (`workbox-config.js`)
 - **Support:** App Store (`.app` folders), Archive (`.sit`), Atom (`.atomproject.{json, cson}`), Data (`fstab`, `magic.mgc`), Download (`.crdownload`), Dylibs (`.appex` and `.ideplugin` folders), Finder (`.DS_Store`, `._*`), Swagger (`swagger.yaml`, `swagger.yml`)
 
+### Fixed
+- [[`#716`][]]: Exception thrown from null filesystem reference
+
+[`#716`]: https://github.com/file-icons/atom/issues/716
 
 
 [v2.1.17] - 2018-02-23

lib/ui.js

@@ -28,16 +28,16 @@ class UI {
 			}),
 			this.onSaveNewFile(args => {
 				const file = FileSystem.get(args.file);
-				file.addEditor(args.editor);
+				file && file.addEditor(args.editor);
 			}),
 			this.onOpenFile(editor => {
 				const path = editor.getPath();
 				let entity = FileSystem.get(path);
-				if("function" !== typeof entity.addEditor){
+				if(!entity || "function" !== typeof entity.addEditor){
 					FileSystem.paths.delete(path);
 					entity = FileSystem.get(path);
 				}
-				entity.addEditor(editor);
+				entity && entity.addEditor(editor);
 			})
 		);
 	}