diff --git a/setup/inc/class.setup.inc.php b/setup/inc/class.setup.inc.php
index 8a0f9314a5..6ed1addefb 100644
--- a/setup/inc/class.setup.inc.php
+++ b/setup/inc/class.setup.inc.php
@@ -556,6 +556,12 @@
 		*/
 		function deregister_hooks($appname)
 		{
+			if ($this->alessthanb($setup_info['phpgwapi']['currentver'],'0.9.8pre5'))
+			{
+				/* No phpgw_hooks table yet. */
+				return False;
+			}
+
 			if(!$appname)
 			{
 				return False;