Index: openacs-4/packages/acs-tcl/tcl/json-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/json-procs.tcl,v
diff -u -r1.7 -r1.8
--- openacs-4/packages/acs-tcl/tcl/json-procs.tcl	7 Aug 2017 23:47:59 -0000	1.7
+++ openacs-4/packages/acs-tcl/tcl/json-procs.tcl	1 Oct 2017 12:16:05 -0000	1.8
@@ -443,7 +443,7 @@
             The Ilias RTE JavaScript returns '' rather than null for JS null variables.
 
 } {
-    switch $value {
+    switch -- $value {
         false { return 0 }
         true { return 1 }
         null -