From d195b3e909ddcd2f983d303164a1855c3557c7ff Mon Sep 17 00:00:00 2001
From: Bruce Wells <brucekwells@gmail.com>
Date: Tue, 19 May 2020 23:00:10 -0400
Subject: Null parameters allowed

---
 src/NXP/MathExecutor.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/NXP/MathExecutor.php b/src/NXP/MathExecutor.php
index 0c643a7..5a20e17 100644
--- a/src/NXP/MathExecutor.php
+++ b/src/NXP/MathExecutor.php
@@ -364,7 +364,7 @@ class MathExecutor
      * @return MathExecutor
      * @throws ReflectionException
      */
-    public function addFunction(string $name, callable $function = null, int $places = null) : self
+    public function addFunction(string $name, ?callable $function = null, ?int $places = null) : self
     {
         $this->functions[$name] = new CustomFunction($name, $function, $places);
         return $this;
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