diff --git a/libraries/src/Document/HtmlDocument.php b/libraries/src/Document/HtmlDocument.php
index 50531488e8565..42a7e06c6d5fe 100644
--- a/libraries/src/Document/HtmlDocument.php
+++ b/libraries/src/Document/HtmlDocument.php
@@ -592,7 +592,7 @@ public function render($caching = false, $params = array())
 	public function countModules($condition)
 	{
 		$operators = '(\+|\-|\*|\/|==|\!=|\<\>|\<|\>|\<=|\>=|and|or|xor)';
-		$words = preg_split('# ' . $operators . ' #', $condition, null, PREG_SPLIT_DELIM_CAPTURE);
+		$words = preg_split('# ' . $operators . ' #', $condition, -1, PREG_SPLIT_DELIM_CAPTURE);
 
 		if (count($words) === 1)
 		{