diff --git a/src/test/utils/CordContainer.py b/src/test/utils/CordContainer.py
index 11f257b..63443b9 100644
--- a/src/test/utils/CordContainer.py
+++ b/src/test/utils/CordContainer.py
@@ -114,7 +114,7 @@
         return '/{0}'.format(self.name) in list(flatten(n['Names'] for n in self.dckr.containers()))
 
     def img_exists(self):
-        return self.image_name[len(self.prefix):] in [ctn['RepoTags'][0] for ctn in self.dckr.images()]
+        return self.image_name in [ctn['RepoTags'][0] if ctn['RepoTags'] else '' for ctn in self.dckr.images()]
 
     def ip(self):
         cnt_list = filter(lambda c: c['Image'] == self.image_name, self.dckr.containers())