Index: branches/RC/admin/install.php
===================================================================
diff -u -N -r10304 -r10832
--- branches/RC/admin/install.php	(.../install.php)	(revision 10304)
+++ branches/RC/admin/install.php	(.../install.php)	(revision 10832)
@@ -1720,12 +1720,14 @@
 	$ado->Execute("DROP TABLE IF EXISTS $EventTable");
 	$ado->Execute('INSERT INTO '.$g_TablePrefix.'Cache (VarName, Data) VALUES (\'ForcePermCacheUpdate\', \'1\')');
 
-	if ($application->ConfigValue('InstallFinished') === false) {
-		$fields_hash = Array (
-			'VariableName'	=>	'InstallFinished',
-			'VariableValue'	=>	1,
-		);
-		$application->Conn->doInsert($fields_hash, TABLE_PREFIX.'ConfigurationValues');
+	$sql = 'SELECT VariableValue
+			FROM ' . $g_TablePrefix . 'ConfigurationValues
+			WHERE VariableName = "InstallFinished"';
+	if (!$ado->GetOne($sql)) {
+		// not installed -> set installation mark
+		$sql = 'INSERT INTO ' . $g_TablePrefix . 'ConfigurationValues (VariableName, VariableValue)
+				VALUES ("InstallFinished", 1)';
+		$ado->Execute($sql);
 	}
 
 	$include_file = $pathtoroot.$admin."/install/install_finish.php";