diff --git a/caliGraph.py b/caliGraph.py
index 8865975..f72f72f 100755
--- a/caliGraph.py
+++ b/caliGraph.py
@@ -818,7 +818,12 @@ def recommenderCompetence(G):
     for n in list(G.nodes):
         node = G.nodes[n]
         if node['t'] == 'recommender':
-            node['score'] -= node['se'] * 1
+            if 'se' in node:
+                node['score'] -= node['se'] * 1
+            else:
+                if not node['score']:
+                    node['score'] = 0
+                node['score'] /= 2
 
 def readBooksAnalysis(G, minRating=0, showAllTags=True, removeUnconnected=False, removeTopListsB=True):
     removeUnread(G)