From c2a9e0ccaa5c441821f320675c559d723df70f3d Mon Sep 17 00:00:00 2001
From: Jonas Strittmatter <40792180+smjonas@users.noreply.github.com>
Date: Thu, 18 Nov 2021 10:57:24 +0100
Subject: [PATCH] Fix possible nil argument to string.byte (#550)

---
 lua/cmp/source.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lua/cmp/source.lua b/lua/cmp/source.lua
index 1d711e3..21566c1 100644
--- a/lua/cmp/source.lua
+++ b/lua/cmp/source.lua
@@ -237,7 +237,7 @@ source.complete = function(self, ctx, callback)
   local before_char = string.sub(ctx.cursor_before_line, -1)
   if ctx:get_reason() == types.cmp.ContextReason.TriggerOnly then
     before_char = string.match(ctx.cursor_before_line, '(.)%s*$')
-    if not char.is_symbol(string.byte(before_char)) then
+    if not before_char or not char.is_symbol(string.byte(before_char)) then
       before_char = ''
     end
   end