diff --git a/phpBB/install/database_update.php b/phpBB/install/database_update.php
index c2e672c863..666cb1aad3 100644
--- a/phpBB/install/database_update.php
+++ b/phpBB/install/database_update.php
@@ -436,7 +436,7 @@ if ($inline_update)
 {
 	if ($current_version !== $latest_version)
 	{
-		set_config('version_update_from', $row['config_value']);
+		set_config('version_update_from', $orig_version);
 	}
 }
 else
@@ -719,7 +719,7 @@ else
 {
 ?>
 
-	<p><?php echo $lang['CONTINUE_INLINE_UPDATE']; ?></p>
+	<p><?php echo ((isset($lang['CONTINUE_INLINE_UPDATE'])) ? $lang['CONTINUE_INLINE_UPDATE'] : 'The database update was successful. Now please close this window and continue the update process as explained.'); ?></p>
 
 	<p><a href="#" onclick="window.close();">&raquo; <?php echo $lang['CLOSE_WINDOW']; ?></a></p>
 
diff --git a/phpBB/install/install_update.php b/phpBB/install/install_update.php
index 117c2f64fa..9913482f84 100644
--- a/phpBB/install/install_update.php
+++ b/phpBB/install/install_update.php
@@ -111,6 +111,21 @@ class install_update extends module
 		// First of all, init the user session
 		$user->session_begin();
 		$auth->acl($user->data);
+
+		// Beta4 and below are having a bug displaying an error if the install directory is present.
+		// This bug got fixed, but we need to get around it by using a tiny 'hack'.
+		if (!defined('DEBUG_EXTRA'))
+		{
+			if (version_compare(strtolower($config['version']), '3.0.b4', '<='))
+			{
+				@define('DEBUG_EXTRA', true);
+			}
+			else if (!empty($config['version_update_from']) && version_compare(strtolower($config['version_update_from']), '3.0.b4', '<='))
+			{
+				@define('DEBUG_EXTRA', true);
+			}
+		}
+
 		$user->setup('install');
 
 		// If we are within the intro page we need to make sure we get up-to-date version info