diff --git a/phpBB/includes/functions_convert.php b/phpBB/includes/functions_convert.php
index 88ea955a42..559921ba35 100644
--- a/phpBB/includes/functions_convert.php
+++ b/phpBB/includes/functions_convert.php
@@ -1241,6 +1241,11 @@ function update_folder_pm_count()
 
 function path($path, $path_relative = true)
 {
+	if ($path === false)
+	{
+		return '';
+	}
+
 	if (substr($path, -1) != '/')
 	{
 		$path .= '/';