Index: openacs-4/packages/acs-tcl/tcl/tcl-documentation-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/tcl-documentation-procs.tcl,v
diff -u -r1.36.2.18 -r1.36.2.19
--- openacs-4/packages/acs-tcl/tcl/tcl-documentation-procs.tcl	4 Mar 2016 08:07:23 -0000	1.36.2.18
+++ openacs-4/packages/acs-tcl/tcl/tcl-documentation-procs.tcl	14 May 2016 10:38:14 -0000	1.36.2.19
@@ -1175,9 +1175,15 @@
             foreach elm [ad_complaints_get_list] {
                 template::multirow append complaints $elm
             }
-            ns_return 422 text/html [ad_parse_template \
-                                         -params [list complaints [list context $::ad_page_contract_context]] \
-                                         "/packages/acs-tcl/lib/complain"]
+            if {[catch {
+                set html [ad_parse_template \
+                              -params [list complaints [list context $::ad_page_contract_context]] \
+                              "/packages/acs-tcl/lib/complain"]
+            } errorMsg]} {
+                ad_log error "problem rendering complain page: $errorMsg"
+                set html "Invalid input"
+            }
+            ns_return 422 text/html $html
 	    ad_script_abort
 	}
     }