@@ -, +, @@ 
---
 .../intranet-tmpl/prog/en/modules/catalogue/itemsearch.tt  | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/itemsearch.tt	
+++ a/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/itemsearch.tt	
@@ -480,10 +480,11 @@ 
                     url: '/cgi-bin/koha/catalogue/itemsearch.pl',
                     data: function ( d ) {
                         for (i in params) {
-                            if (! d.hasOwnProperty(params[i].name) ) {
-                                d[params[i].name] = [];
+                            if(d[params[i].name]){
+                                d[params[i].name] = [].concat(d[params[i].name], params[i].value);
+                            }else{
+                                d[params[i].name] = params[i].value;
                             }
-                            d[params[i].name].push(params[i].value);
                         }
                         d.format = 'json';
                         d.columns = JSON.stringify( d.columns );
--