diff --git a/authzgroups.php b/authzgroups.php
index 74f1eb8..ba94be5 100644
--- a/authzgroups.php
+++ b/authzgroups.php
@@ -70,10 +70,17 @@ class authzgroups
     if ($user !== "cli" && $user !== "root")
       $st->bindValue (":user", $user);
     $st->bindValue (":module", $module);
-    $rc = $st->execute ();
-    if ($rc === false)
+    try
     {
-      if ($this->dbObject->debug) echo "DEBUG : EXECUTE ERROR ! Return FALSE\n";
+      $rc = $st->execute ();
+      if ($rc === false)
+        throw new Exception ("Can't execute SQL request", 500);
+    }
+    catch (Exception $e)
+    {
+      if ($this->dbObject->debug) echo "DEBUG : EXECUTE ERROR ! Return FALSE".
+         $e->getMessage()."\n";
+      throw new Exception ($e->getMessage(), 500);
     }
     $res = array ();
     while ($d = $st->fetch (PDO::FETCH_ASSOC))
@@ -301,6 +308,12 @@ class authzgroups
     return TRUE;
   }
 
+  /** Disconnect from the database. Should be only used in the unit tests */
+  public function disconnect ()
+  {
+    $this->dbObject->disconnect ();
+  }
+
   /** Create the tables in the database to store the datas */
   public function createTables ()
   {