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");
diff --git a/src/FontLib/BinaryStream.php b/src/FontLib/BinaryStream.php
index ab10454..414ef03 100644
--- a/src/FontLib/BinaryStream.php
+++ b/src/FontLib/BinaryStream.php
@@ -38,16 +38,17 @@ class BinaryStream {
   const modeReadWrite = "rb+";
 
   static function backtrace() {
-    var_dump(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS));
+      var_dump(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS));
   }
 
-  /**
-   * Open a font file in read mode
-   *
-   * @param string $filename The file name of the font to open
-   *
-   * @return bool
-   */
+    /**
+     * Open a font file in read mode
+     *
+     * @param string $filename The file name of the font to open
+     *
+     * @return bool
+     * @throws \Exception
+     */
   public function load($filename) {
     return $this->open($filename, self::modeRead);
   }
@@ -142,7 +143,8 @@ public function read($n) {
       return "";
     }
 
-    return fread($this->f, $n);
+    // handle the return data, DO NOT spew E_NOTICEs
+    return @fread($this->f, $n);
   }
 
   public function write($data, $length = null) {
@@ -150,7 +152,8 @@ public function write($data, $length = null) {
       return 0;
     }
 
-    return fwrite($this->f, $data, $length);
+    // handle the return data, DO NOT spew E_NOTICEs
+    return @fwrite($this->f, $data, $length);
   }
 
   public function readUInt8() {