diff --git a/DXFighter.php b/DXFighter.php
index b3282b6..b866a3a 100644
--- a/DXFighter.php
+++ b/DXFighter.php
@@ -29,6 +29,8 @@
 use DXFighter\lib\Polyline;
 use DXFighter\lib\Spline;
 use DXFighter\lib\Text;
+use Psr\Log\LoggerAwareInterface;
+use Psr\Log\LoggerAwareTrait;
 
 /**
  * Returns the class name, used for auto loading libraries
@@ -53,9 +55,11 @@ function dxf_autoloader($className) {
  * Class DXFighter
  * @package DXFighter
  */
-class DXFighter {
+class DXFighter implements LoggerAwareInterface{
   protected $sections;
 
+  use LoggerAwareTrait;
+
   /**
    * @var Section
    */
@@ -225,7 +229,7 @@ public function move($move) {
       if (method_exists($entity, 'move')) {
         $entity->move($move);
       } else {
-        echo 'The ' . get_class($entity) . ' class does not have a move function.' . PHP_EOL;
+        $this->logger?->warning('The ' . get_class($entity) . ' class does not have a move function.' . PHP_EOL);
       }
     }
   }
@@ -241,7 +245,7 @@ public function rotate($rotate, $rotationCenter = array(0, 0, 0)) {
       if (method_exists($entity, 'rotate')) {
         $entity->rotate($rotate, $rotationCenter);
       } else {
-        echo 'The ' . get_class($entity) . ' class does not have a rotate function.' . PHP_EOL;
+        $this->logger?->warning('The ' . get_class($entity) . ' class does not have a rotate function.' . PHP_EOL);
       }
     }
   }
@@ -432,7 +436,8 @@ private function readBlocksSection($values) {
             $block = [];
             break;
           case 'ENDBLK':
-            $blockEntity = new Block($block[2]);
+            $name = $block[2] ?? '';
+            $blockEntity = new Block($name);
             $entities = $this->readEntitiesSection($entitiesSection);
             foreach ($entities as $entity) {
               $blockEntity->addEntity($entity);
@@ -631,7 +636,7 @@ private function addReadEntity($type, $data, $move = [0,0,0], $rotate = 0) {
               $polyline = new Polyline(3);
               break;
             default:
-              echo 'The polyline type ' . $data[100] . ' has not been found' . PHP_EOL;
+              $this->logger?->notice( 'The polyline type ' . $data[100] . ' has not been found' . PHP_EOL );
               return false;
           }
         } else {
diff --git a/composer.json b/composer.json
index a3d0f7e..92e871c 100644
--- a/composer.json
+++ b/composer.json
@@ -8,6 +8,7 @@
         }
     ],
     "require": {
+        "psr/log": "^3.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^7",
diff --git a/composer.lock b/composer.lock
index be6bc7d..773760f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,12 +1,62 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "hash": "29e31dd3857245fbce28e9722c371a91",
-    "content-hash": "318c4c61460690ea91f8c317d50e9ec3",
-    "packages": [],
+    "content-hash": "60eb8e218bf7a90f2f742714187a5425",
+    "packages": [
+        {
+            "name": "psr/log",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/log.git",
+                "reference": "fe5ea303b0887d5caefd3d431c3e61ad47037001"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/log/zipball/fe5ea303b0887d5caefd3d431c3e61ad47037001",
+                "reference": "fe5ea303b0887d5caefd3d431c3e61ad47037001",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.0.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Log\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "https://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for logging libraries",
+            "homepage": "https://github.com/php-fig/log",
+            "keywords": [
+                "log",
+                "psr",
+                "psr-3"
+            ],
+            "support": {
+                "source": "https://github.com/php-fig/log/tree/3.0.0"
+            },
+            "time": "2021-07-14T16:46:02+00:00"
+        }
+    ],
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
@@ -60,7 +110,7 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2017-07-22 11:58:36"
+            "time": "2017-07-22T11:58:36+00:00"
         },
         {
             "name": "myclabs/deep-copy",
@@ -105,7 +155,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2017-10-19 19:58:43"
+            "time": "2017-10-19T19:58:43+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -160,7 +210,7 @@
                 }
             ],
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2017-03-05 18:14:27"
+            "time": "2017-03-05T18:14:27+00:00"
         },
         {
             "name": "phar-io/version",
@@ -207,7 +257,7 @@
                 }
             ],
             "description": "Library for handling version information and constraints",
-            "time": "2017-03-05 17:38:23"
+            "time": "2017-03-05T17:38:23+00:00"
         },
         {
             "name": "phpcheckstyle/phpcheckstyle",
@@ -252,7 +302,7 @@
                 "convention",
                 "standard"
             ],
-            "time": "2017-11-10 15:01:41"
+            "time": "2017-11-10T15:01:41+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
@@ -306,7 +356,7 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2017-09-11 18:02:19"
+            "time": "2017-09-11T18:02:19+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
@@ -357,7 +407,7 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2017-11-30 07:14:17"
+            "time": "2017-11-30T07:14:17+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
@@ -404,7 +454,7 @@
                     "email": "me@mikevanriel.com"
                 }
             ],
-            "time": "2017-07-14 14:27:02"
+            "time": "2017-07-14T14:27:02+00:00"
         },
         {
             "name": "phpspec/prophecy",
@@ -467,7 +517,7 @@
                 "spy",
                 "stub"
             ],
-            "time": "2018-04-18 13:57:24"
+            "time": "2018-04-18T13:57:24+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
@@ -530,7 +580,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2018-04-06 15:39:20"
+            "time": "2018-04-06T15:39:20+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -577,7 +627,7 @@
                 "filesystem",
                 "iterator"
             ],
-            "time": "2017-11-27 13:52:08"
+            "time": "2017-11-27T13:52:08+00:00"
         },
         {
             "name": "phpunit/php-text-template",
@@ -618,7 +668,7 @@
             "keywords": [
                 "template"
             ],
-            "time": "2015-06-21 13:50:34"
+            "time": "2015-06-21T13:50:34+00:00"
         },
         {
             "name": "phpunit/php-timer",
@@ -667,7 +717,7 @@
             "keywords": [
                 "timer"
             ],
-            "time": "2018-02-01 13:07:23"
+            "time": "2018-02-01T13:07:23+00:00"
         },
         {
             "name": "phpunit/php-token-stream",
@@ -716,7 +766,7 @@
             "keywords": [
                 "tokenizer"
             ],
-            "time": "2018-02-01 13:16:43"
+            "time": "2018-02-01T13:16:43+00:00"
         },
         {
             "name": "phpunit/phpunit",
@@ -796,7 +846,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2018-04-18 13:41:53"
+            "time": "2018-04-18T13:41:53+00:00"
         },
         {
             "name": "phpunit/phpunit-mock-objects",
@@ -852,7 +902,7 @@
                 "mock",
                 "xunit"
             ],
-            "time": "2018-04-11 04:50:36"
+            "time": "2018-04-11T04:50:36+00:00"
         },
         {
             "name": "sebastian/code-unit-reverse-lookup",
@@ -897,7 +947,7 @@
             ],
             "description": "Looks up which function or method a line of code belongs to",
             "homepage": "https://github.com/sebastianbergmann/code-unit-reverse-lookup/",
-            "time": "2017-03-04 06:30:41"
+            "time": "2017-03-04T06:30:41+00:00"
         },
         {
             "name": "sebastian/comparator",
@@ -961,7 +1011,7 @@
                 "compare",
                 "equality"
             ],
-            "time": "2018-04-18 13:33:00"
+            "time": "2018-04-18T13:33:00+00:00"
         },
         {
             "name": "sebastian/diff",
@@ -1017,7 +1067,7 @@
                 "unidiff",
                 "unified diff"
             ],
-            "time": "2018-02-01 13:45:15"
+            "time": "2018-02-01T13:45:15+00:00"
         },
         {
             "name": "sebastian/environment",
@@ -1067,7 +1117,7 @@
                 "environment",
                 "hhvm"
             ],
-            "time": "2017-07-01 08:51:00"
+            "time": "2017-07-01T08:51:00+00:00"
         },
         {
             "name": "sebastian/exporter",
@@ -1134,7 +1184,7 @@
                 "export",
                 "exporter"
             ],
-            "time": "2017-04-03 13:19:02"
+            "time": "2017-04-03T13:19:02+00:00"
         },
         {
             "name": "sebastian/global-state",
@@ -1185,7 +1235,7 @@
             "keywords": [
                 "global state"
             ],
-            "time": "2017-04-27 15:39:26"
+            "time": "2017-04-27T15:39:26+00:00"
         },
         {
             "name": "sebastian/object-enumerator",
@@ -1232,7 +1282,7 @@
             ],
             "description": "Traverses array structures and object graphs to enumerate all referenced objects",
             "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
-            "time": "2017-08-03 12:35:26"
+            "time": "2017-08-03T12:35:26+00:00"
         },
         {
             "name": "sebastian/object-reflector",
@@ -1277,7 +1327,7 @@
             ],
             "description": "Allows reflection of object attributes, including inherited and non-public ones",
             "homepage": "https://github.com/sebastianbergmann/object-reflector/",
-            "time": "2017-03-29 09:07:27"
+            "time": "2017-03-29T09:07:27+00:00"
         },
         {
             "name": "sebastian/recursion-context",
@@ -1330,7 +1380,7 @@
             ],
             "description": "Provides functionality to recursively process PHP variables",
             "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
-            "time": "2017-03-03 06:23:57"
+            "time": "2017-03-03T06:23:57+00:00"
         },
         {
             "name": "sebastian/resource-operations",
@@ -1372,7 +1422,7 @@
             ],
             "description": "Provides a list of PHP built-in functions that operate on resources",
             "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
-            "time": "2015-07-28 20:34:47"
+            "time": "2015-07-28T20:34:47+00:00"
         },
         {
             "name": "sebastian/version",
@@ -1415,7 +1465,7 @@
             ],
             "description": "Library that helps with managing the version number of Git-hosted PHP projects",
             "homepage": "https://github.com/sebastianbergmann/version",
-            "time": "2016-10-03 07:35:21"
+            "time": "2016-10-03T07:35:21+00:00"
         },
         {
             "name": "theseer/tokenizer",
@@ -1455,7 +1505,7 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2017-04-07 12:08:54"
+            "time": "2017-04-07T12:08:54+00:00"
         },
         {
             "name": "webmozart/assert",
@@ -1505,7 +1555,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2018-01-29 19:49:41"
+            "time": "2018-01-29T19:49:41+00:00"
         }
     ],
     "aliases": [],
@@ -1514,5 +1564,6 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": [],
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.1.0"
 }
diff --git a/lib/Entity.php b/lib/Entity.php
index 6e7b97c..5d4e647 100644
--- a/lib/Entity.php
+++ b/lib/Entity.php
@@ -84,7 +84,7 @@ public function setFlag($id, $value) {
    * Retrieves a flag value for an entity.
    */
   public function getFlag($id) {
-    return $this->flags[$id];
+    return $this->flags[$id] ?? null;
   }
 
   /**