From 9994ed8b5ef575bb6d226fecb25907f1b41c2e0c Mon Sep 17 00:00:00 2001
From: Ivan Kravets <me@ikravets.com>
Date: Thu, 27 Jul 2017 15:50:54 +0300
Subject: [PATCH] Check context arguments before comparison // Resolve #1000

---
 platformio/maintenance.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/platformio/maintenance.py b/platformio/maintenance.py
index b51fbdf8..5109e0a6 100644
--- a/platformio/maintenance.py
+++ b/platformio/maintenance.py
@@ -39,7 +39,7 @@ def in_silence(ctx=None):
     assert ctx
     ctx_args = ctx.args or []
     conditions = [
-        ctx.args[0] == "upgrade", "--json-output" in ctx_args,
+        ctx_args and ctx.args[0] == "upgrade", "--json-output" in ctx_args,
         "--version" in ctx_args
     ]
     return ctx_args and any(conditions)