Index: openacs-4/packages/acs-templating/tcl/richtext-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-templating/tcl/richtext-procs.tcl,v
diff -u -r1.66.2.7 -r1.66.2.8
--- openacs-4/packages/acs-templating/tcl/richtext-procs.tcl	16 Jan 2022 15:31:23 -0000	1.66.2.7
+++ openacs-4/packages/acs-templating/tcl/richtext-procs.tcl	30 Mar 2022 07:59:30 -0000	1.66.2.8
@@ -439,6 +439,10 @@
     if { [info exists element(value)] } {
         set contents [template::util::richtext::get_property contents $element(value)]
         set format   [template::util::richtext::get_property format $element(value)]
+        if {![string is list $format] || $format ni [template::util::richtext::formats]} {
+            ns_log warning "Ignoring provided format '$format' for richtext widget with id $element(id)"
+            set format {}
+        }
     } else {
         set contents {}
         set format {}