From 8726f8317c0bd4bc0251bea3f6658ef5cc75b0e2 Mon Sep 17 00:00:00 2001
From: Ivan Kravets <me@ikravets.com>
Date: Fri, 15 Jul 2016 18:59:10 +0300
Subject: [PATCH] Typo fix

---
 platformio/builder/tools/platformio.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/platformio/builder/tools/platformio.py b/platformio/builder/tools/platformio.py
index c3440897..6010088f 100644
--- a/platformio/builder/tools/platformio.py
+++ b/platformio/builder/tools/platformio.py
@@ -149,7 +149,8 @@ def ProcessFlags(env, flags):
 def ProcessUnFlags(env, flags):
     if not flags:
         return
-    flags = " ".join(flags)
+    if isinstance(flags, list):
+        flags = " ".join(flags)
     parsed_flags = env.ParseFlags(flags)
     all_flags = []
     for items in parsed_flags.values():