Index: openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl,v
diff -u -r1.368.2.102 -r1.368.2.103
--- openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl	25 Dec 2021 16:10:23 -0000	1.368.2.102
+++ openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl	29 Dec 2021 15:38:23 -0000	1.368.2.103
@@ -742,6 +742,17 @@
     }
 
     set full_file_name [:full_file_name]
+
+    if {![ad_file exists $full_file_name]} {
+      # This should not happen on a production system, however it
+      # might on a test system that does not have a copy of the
+      # content-repository folder. We fail more gracefully in this
+      # case.
+      ad_log warning "::xowiki::File www-download: '$full_file_name' does not exist on the filesystem, returning 404"
+      ns_returnnotfound
+      ad_script_abort
+    }
+
     #:log "--F FILE=$full_file_name // ${:mime_type}"
 
     set geometry [::xo::cc query_parameter geometry ""]