Index: openacs-4/packages/acs-tcl/tcl/site-nodes-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/site-nodes-procs.tcl,v
diff -u -r1.93.2.7 -r1.93.2.8
--- openacs-4/packages/acs-tcl/tcl/site-nodes-procs.tcl	9 Oct 2015 13:25:11 -0000	1.93.2.7
+++ openacs-4/packages/acs-tcl/tcl/site-nodes-procs.tcl	11 Oct 2015 17:22:23 -0000	1.93.2.8
@@ -67,9 +67,10 @@
 #
 
 if {[info commands ::nx::Object] ne ""
+    && [ns_info name] eq "NaviServer"
     && [db_driverkey ""] eq "postgresql"
+    && [db_string check_base_tables {select 1 from pg_class where relname = 'apm_package_versions'} -default 0]
     && [apm_package_installed_p xotcl-core]
-    && [ns_info name] eq "NaviServer"
 } {
     set UseXotclSiteNodes 1
     ns_log notice "use XOTcl Site Nodes"