diff --git a/lib/cache/cache.class.php b/lib/cache/cache.class.php
index fe773c4532..5a4acb082b 100644
--- a/lib/cache/cache.class.php
+++ b/lib/cache/cache.class.php
@@ -454,7 +454,7 @@ class cache
      */
     private function delete()
     {
-        if(empty($this->objects)) return;
+        if(empty($this->objects)) return $this->log('No objects to delete.', __FILE__, __LINE__);
 
         $code         = $this->getTableCode();
         $setCacheKey  = $this->getSetCacheKey($code);
diff --git a/lib/dbh/dbh.class.php b/lib/dbh/dbh.class.php
index 44c1f95ff4..83f306d17a 100644
--- a/lib/dbh/dbh.class.php
+++ b/lib/dbh/dbh.class.php
@@ -244,7 +244,8 @@ class dbh
         {
             $result   = false;
             $begin    = microtime(true);
-            $result   = $this->pdo->query($sql);
+            $method   = $mode == 'exec' ? 'exec' : 'query';
+            $result   = $this->pdo->$method($sql);
             $duration = microtime(true) - $begin;
         }
         catch(PDOException $e)