diff --git a/ranker/server.py b/ranker/server.py
index ecbf977..8094921 100644
--- a/ranker/server.py
+++ b/ranker/server.py
@@ -16,7 +16,7 @@
 from ranker.util.omnicorp_get_node_pmids import get_node_pmids
 
 # set the app version
-APP_VERSION = '3.3.2'
+APP_VERSION = '3.3.3'
 
 APP = FastAPI(title='ARAGORN Ranker', version=APP_VERSION)
 
diff --git a/ranker/shared/ranker_obj.py b/ranker/shared/ranker_obj.py
index 85fcc8f..ac5b5a5 100644
--- a/ranker/shared/ranker_obj.py
+++ b/ranker/shared/ranker_obj.py
@@ -489,8 +489,8 @@ def get_edge_values(self, edge_id):
 
         # Look through attributes and 
         for attribute in edge.get("attributes", []):
-            orig_attr_name = attribute.get("original_attribute_name", None)
-            attr_type_id = attribute.get("attribute_type_id", None)
+            orig_attr_name = attribute.get("original_attribute_name", '')
+            attr_type_id = attribute.get("attribute_type_id", '')
 
             # We will look at both the original_attribute_name and the
             # attribute_type_id. The attribute_type_id is the real method