From a23001915e10f064aeb9d30e544cecb8182094bd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fabian-Robert=20St=C3=B6ter?=
 <fabian-robert.stoeter@audiolabs-erlangen.de>
Date: Wed, 20 Dec 2017 12:23:13 +0100
Subject: [PATCH] more explicit fix

---
 stempeg/write.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/stempeg/write.py b/stempeg/write.py
index 4b51726..388735f 100644
--- a/stempeg/write.py
+++ b/stempeg/write.py
@@ -69,8 +69,13 @@ def write_stems(
     """
     if codec is None:
         avail = check_available_aac_encoders()
-        if 'libfdk_aac' in avail:
-            codec = 'libfdk_aac'
+
+        if avail is not None:
+            if 'libfdk_aac' in avail:
+                codec = 'libfdk_aac'
+            else:
+                codec = 'aac'
+                warnings.warn("For better quality, please install libfdc_aac")
         else:
             codec = 'aac'
             warnings.warn("For better quality, please install libfdc_aac")