diff --git a/docker_custodian/docker_gc.py b/docker_custodian/docker_gc.py
index cfcfa83..68a33f4 100644
--- a/docker_custodian/docker_gc.py
+++ b/docker_custodian/docker_gc.py
@@ -77,6 +77,8 @@ def get_all_images(client):
 def get_dangling_volumes(client):
     log.info("Getting dangling volumes")
     volumes = client.volumes({'dangling': True})['Volumes']
+    if volumes == None:
+        volumes = []
     log.info("Found %s dangling volumes", len(volumes))
     return volumes