Index: openacs-4/packages/ecommerce/tcl/ecommerce-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/ecommerce/tcl/ecommerce-procs.tcl,v
diff -u -N -r1.31 -r1.32
--- openacs-4/packages/ecommerce/tcl/ecommerce-procs.tcl	15 Nov 2008 12:07:03 -0000	1.31
+++ openacs-4/packages/ecommerce/tcl/ecommerce-procs.tcl	15 Nov 2008 22:00:40 -0000	1.32
@@ -1463,11 +1463,13 @@
                     set current_url [ns_conn url]
                     if { [parameter::get -parameter CacheProductAsFile -default 0] && [string match "*[ec_url]product*" $current_url ] } {
                         regexp {product_id=([1-9][0-9]*)} $current_url scratch product_id
-                        db_0or1row get_sku_from_product_id "select sku from ec_products where product_id = :product_id"
-                        if { [info exists sku] && [file exists "[file join [acs_root_dir] www [string trim [ec_url] /] ${sku}.html]"] } {
-                            # this is a valid product url, redirect to the existing static version
-                            ad_returnredirect "[ec_url]${sku}.html"
-                            ad_script_abort
+                        if { [info exists product_id] } {
+                            db_0or1row get_sku_from_product_id "select sku from ec_products where product_id = :product_id"
+                            if { [info exists sku] && [file exists "[file join [acs_root_dir] www [string trim [ec_url] /] ${sku}.html]"] } {
+                                # this is a valid product url, redirect to the existing static version
+                                ad_returnredirect "[ec_url]${sku}.html"
+                                ad_script_abort
+                            }
                         }
                     }