diff -uNr Zope-2.8.6-final/lib/python/Shared/DC/ZRDB/DA.py Zope-2.8.6-dirk/lib/python/Shared/DC/ZRDB/DA.py
--- Zope-2.8.6-final/lib/python/Shared/DC/ZRDB/DA.py	Wed Mar 15 17:28:30 2006
+++ Zope-2.8.6-dirk/lib/python/Shared/DC/ZRDB/DA.py	Mon Apr 10 13:05:58 2006
@@ -372,7 +372,7 @@
                 key=keys[-1]
                 q=tcache[key]
                 del tcache[key]
-                if int(cache[q][0]) == key:
+                if cache.has_key(q) and int(cache[q][0]) == key:
                     del cache[q]
                 del keys[-1]