diff --git a/workflows/gobrowser.py b/workflows/gobrowser.py
index 5768ac4..aca0872 100644
--- a/workflows/gobrowser.py
+++ b/workflows/gobrowser.py
@@ -213,6 +213,9 @@ class LoadGOFunction(workflow.Function):
 
     def run(self):
         global go
+        if go:
+            return
+
         go = geneontology.read_default_go()
         browser = GeneOntologyTree(go)
         label = gtk.Label('_Gene Ontology')