diff --git a/dblayeroo.php b/dblayeroo.php
index 965254d..dbeaba9 100644
--- a/dblayeroo.php
+++ b/dblayeroo.php
@@ -1321,11 +1321,19 @@ class dblayeroo
     $this->joins = array ();
     $this->whereExpression = array ();
     $this->whereValues = array ();
+    $this->groupByExpression = null;
     $this->orderExpression = array ();
     $this->limitExpression = "";
     $this->setValues = array ();
     $this->setType = array ();
     $this->setForeignObj = array ();
+    if ($this->joinObject !== null)
+    {
+      foreach ($this->joinObject as $obj)
+      {
+        $obj->clearRequest ();
+      }
+    }
   }
   /* }}} */
 
@@ -2606,6 +2614,11 @@ class dblayeroo
   /* {{{ */
   {
     $backtrace = debug_backtrace ();
+    if ($this->debug)
+    {
+      require_once ("domframework/backtrace.php");
+      \backtrace::show (debug_backtrace ());
+    }
     if (! array_key_exists (1, $backtrace))
       unset ($backtrace);
     else