diff --git a/controllers/agents.js b/controllers/agents.js
index 8e82bb2c..56009675 100644
--- a/controllers/agents.js
+++ b/controllers/agents.js
@@ -957,7 +957,9 @@ router.delete('/', function(req, res) {
         return;
     }
 
-    data_request['arguments']['purge'] = 'purge' in req.query && (req.query['purge'] == true || req.query['purge'] == 'true');
+    logger.debug('purge' in req.query && (req.query.purge == 'true' || req.query.purge == ''));
+
+    data_request['arguments']['purge'] = 'purge' in req.query && (req.query.purge == true || req.query.purge == '');
 
     if ('ids' in req.body)
         data_request['arguments']['list_agent_ids'] = req.body.ids;
diff --git a/helpers/input_validation.js b/helpers/input_validation.js
index 43310661..b4fd72be 100755
--- a/helpers/input_validation.js
+++ b/helpers/input_validation.js
@@ -145,7 +145,7 @@ exports.timeframe_type = function(param) {
 
 exports.boolean = function(n) {
     if (typeof n != 'undefined'){
-        var regex = /^true|false$/;
+        var regex = /^$|(^true|false$)/;
         return regex.test(n);
     }
     else