From d93565423ae7ef9d8ebf4422c86d5dcf965d73ff Mon Sep 17 00:00:00 2001
From: Nathan Sobo <nathan@github.com>
Date: Tue, 16 Jan 2018 11:30:27 -0600
Subject: [PATCH] Null guard auto-prefixing of '.' to scopes for backward
 compatibility

In some cases, packages such as atom-beautify manually construct scope
descriptors with an empty scopes array.
---
 src/scope-descriptor.coffee | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/scope-descriptor.coffee b/src/scope-descriptor.coffee
index 2085bd6b2..3990d12a8 100644
--- a/src/scope-descriptor.coffee
+++ b/src/scope-descriptor.coffee
@@ -41,7 +41,7 @@ class ScopeDescriptor
   getScopeChain: ->
     # For backward compatibility, prefix TextMate-style scope names with
     # leading dots (e.g. 'source.js' -> '.source.js').
-    if @scopes[0].includes('.')
+    if @scopes[0]?.includes('.')
       result = ''
       for scope, i in @scopes
         result += ' ' if i > 0