Index: openacs-4/packages/search/tcl/search-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/search/tcl/search-procs.tcl,v
diff -u -N -r1.55 -r1.55.2.1
--- openacs-4/packages/search/tcl/search-procs.tcl	29 Jan 2019 19:14:32 -0000	1.55
+++ openacs-4/packages/search/tcl/search-procs.tcl	14 Feb 2019 16:15:01 -0000	1.55.2.1
@@ -420,7 +420,7 @@
     if {[apm_package_installed_p dotlrn]} {
         set site_node [site_node::get_node_id_from_object_id -object_id $package_id]
         set dotlrn_package_id [site_node::closest_ancestor_package -node_id $site_node -package_key dotlrn -include_self]
-        set community_id [db_string get_community_id {select community_id from dotlrn_communities_all where package_id=:dotlrn_package_id} -default [db_null]]
+        set community_id [db_string get_community_id {select community_id from dotlrn_communities_all where package_id=:dotlrn_package_id} -default ""]
         return $community_id
     }
     return ""