diff -rupN zynjacku-5.old/zynjacku.py zynjacku-5/zynjacku.py
--- zynjacku-5.old/zynjacku.py	2009-06-05 12:40:05.000000000 -0400
+++ zynjacku-5/zynjacku.py	2010-01-22 17:59:56.000000000 -0500
@@ -2432,7 +2432,10 @@ class host:
 
             plugins = self.lv2db.getPluginList()
 
-            step = 1.0 / len(plugins)
+            if len(plugins) > 0:
+                step = 1.0 / len(plugins)
+            else:
+                step = 1.0
             progress = 0.0
 
             for uri in plugins: