diff --git a/phpBB/phpbb/textformatter/s9e/factory.php b/phpBB/phpbb/textformatter/s9e/factory.php
index f82c7b0771..725844e2d3 100644
--- a/phpBB/phpbb/textformatter/s9e/factory.php
+++ b/phpBB/phpbb/textformatter/s9e/factory.php
@@ -218,7 +218,7 @@ class factory implements \phpbb\textformatter\cache_interface
 		{
 			$configurator->urlConfig->disallowScheme($scheme);
 		}
-		foreach (explode(',', $this->config['allowed_schemes_links']) as $scheme)
+		foreach (array_filter(explode(',', $this->config['allowed_schemes_links'])) as $scheme)
 		{
 			$configurator->urlConfig->allowScheme(trim($scheme));
 		}