Index: openacs-4/packages/categories/tcl/category-trees-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/categories/tcl/category-trees-procs.tcl,v
diff -u -N -r1.31.2.9 -r1.31.2.10
--- openacs-4/packages/categories/tcl/category-trees-procs.tcl	26 Apr 2019 13:34:13 -0000	1.31.2.9
+++ openacs-4/packages/categories/tcl/category-trees-procs.tcl	26 Apr 2019 13:44:03 -0000	1.31.2.10
@@ -477,7 +477,10 @@
         Reloads all category tree translations in the cache.
         @author Timo Hentschel (timo@timohentschel.de)
     } {
-        catch {nsv_unset category_tree_translations}
+        if {[nsv_names category_tree_translations] ne ""} {
+            nsv_unset category_tree_translations
+        }
+
         set tree_id_old 0
         db_foreach reset_translation_cache {
 	    select tree_id, locale, name, description