From 31cad9151aa2a7070e73bc53dc2d104fdce7e0c6 Mon Sep 17 00:00:00 2001
From: LinkingYou <frank.mueller@linking-you.de>
Date: Thu, 19 Dec 2019 16:40:08 +0100
Subject: [PATCH] Fixes a problem with php 7.4

This would fix the issue #75
---
 src/FontLib/AdobeFontMetrics.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/FontLib/AdobeFontMetrics.php b/src/FontLib/AdobeFontMetrics.php
index a62daaa..a0e973b 100644
--- a/src/FontLib/AdobeFontMetrics.php
+++ b/src/FontLib/AdobeFontMetrics.php
@@ -139,7 +139,7 @@ function write($file, $encoding = null) {
       $this->endSection("CharMetrics");
 
       $kern = $font->getData("kern", "subtable");
-      $tree = $kern["tree"];
+      $tree = is_array($kern) ? $kern["tree"] : null;
 
       if (!$encoding && is_array($tree)) {
         $this->startSection("KernData");