diff --git a/lib-php/template/details-json.php b/lib-php/template/details-json.php
index 0449dbb9..a813b9a6 100644
--- a/lib-php/template/details-json.php
+++ b/lib-php/template/details-json.php
@@ -81,10 +81,14 @@ if ($bIncludeKeywords) {
 
     if ($aPlaceSearchNameKeywords) {
         $aPlaceDetails['keywords']['name'] = array_map($funcMapKeyword, $aPlaceSearchNameKeywords);
+    } else {
+        $aPlaceDetails['keywords']['name'] = array();
     }
 
     if ($aPlaceSearchAddressKeywords) {
         $aPlaceDetails['keywords']['address'] = array_map($funcMapKeyword, $aPlaceSearchAddressKeywords);
+    } else {
+        $aPlaceDetails['keywords']['address'] = array();
     }
 }