diff --git a/ext/readline/tests/readline_nullparam.phpt b/ext/readline/tests/readline_nullparam.phpt
new file mode 100644
index 0000000000..0ebe69f7e5
--- /dev/null
+++ b/ext/readline/tests/readline_nullparam.phpt
@@ -0,0 +1,14 @@
+--TEST--
+Test the function readline with null parameter (wrong because the function expects a string parameter).
+--CREDITS--
+Rodrigo Prado de Jesus <royopa [at] gmail [dot] com>
+User Group: PHPSP #phptestfestbrasil
+http://phpsp.org.br/
+--SKIPIF--
+<?php if (!extension_loaded("readline") die("skip"); ?>
+--FILE--
+<?php
+$line = readline(null);
+?>
+--EXPECTF--
+Warning: readline() expects parameter 1 to be string, null given in %s on line %d