Index: openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl,v
diff -u -r1.10 -r1.11
--- openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl	16 Jun 2015 20:33:08 -0000	1.10
+++ openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl	30 Jun 2015 09:22:44 -0000	1.11
@@ -642,7 +642,14 @@
       ns_log notice "-- upgrading to $v"
       
       foreach package_id [::xowiki::Package instances -closure true] {
-        ::xowiki::Package initialize -package_id $package_id -init_url false
+        ns_log notice "::xowiki::Package initialize -package_id $package_id -init_url false"
+        if {[catch {
+          ::xowiki::Package initialize -package_id $package_id -init_url false
+        } errorMsg]} {
+          ns_log notice "Could not initialize package '$package_id': $errorMsg"
+          continue
+        }
+        ns_log notice "update prototype pages"
         # reload updated prototype pages
         $package_id import-prototype-page bib
         $package_id import-prototype-page news