Index: openacs-4/packages/acs-tcl/tcl/install-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/install-procs.tcl,v
diff -u -N -r1.35 -r1.36
--- openacs-4/packages/acs-tcl/tcl/install-procs.tcl	11 Jun 2018 09:14:55 -0000	1.35
+++ openacs-4/packages/acs-tcl/tcl/install-procs.tcl	12 Feb 2019 17:12:18 -0000	1.36
@@ -291,9 +291,7 @@
     set context_id [apm_attribute_value -default "" $node context-id]
     set security_inherit_p [apm_attribute_value -default "t" $node security-inherit-p]
 
-    if {$context_id eq ""} {
-        set context_id [db_null]
-    } else {
+    if {$context_id ne ""} {
         set context_id [install::xml::util::get_id $context_id]
     }