Index: units/orders/orders_event_handler.php
===================================================================
--- units/orders/orders_event_handler.php	(revision 14705)
+++ units/orders/orders_event_handler.php	(working copy)
@@ -245,24 +245,32 @@
 	}
 
 	/**
-	 * Enter description here...
+	 * Updates shopping cart with logged-in user details
 	 *
-	 * @param unknown_type $event
-	 * @return unknown
+	 * @param kEvent $event
+	 * @return void
+	 * @access protected
 	 */
-	function OnUserLogin(&$event)
+	protected function OnUserLogin(&$event)
 	{
-		if( !($event->MasterEvent->status == kEvent::erSUCCESS) ) {
-			return false;
+		if ( ($event->MasterEvent->status != kEvent::erSUCCESS) || kUtil::constOn('IS_INSTALL') ) {
+			// login failed OR login during installation
+			return;
 		}
 
 		$ses_id = $this->Application->RecallVar('ord_id');
-		if ($ses_id) $this->updateUserID($ses_id, $event);
+		
+		if ( $ses_id ) {
+			$this->updateUserID($ses_id, $event);
+		}
 
 		$user_id = $this->Application->RecallVar('user_id');
 		$affiliate_id = $this->isAffiliate($user_id);
-		if($affiliate_id) $this->Application->setVisitField('AffiliateId', $affiliate_id);
 
+		if ( $affiliate_id ) {
+			$this->Application->setVisitField('AffiliateId', $affiliate_id);
+		}
+
 		$event->CallSubEvent('OnRecalculateItems');
 	}