diff --git a/src/ServiceProvider.php b/src/ServiceProvider.php
index 8014b68..d8630fd 100644
--- a/src/ServiceProvider.php
+++ b/src/ServiceProvider.php
@@ -180,18 +180,7 @@ public function __construct(
         string $filename = self::SERVICE_CONFIG_FILE,
         ?string $pathBundlesConfig = null
     ) {
-        // Buggy local fix.
-        $_ENV['DEBUG'] = env('DEBUG', false);
-        if (array_key_exists('APP_DEBUG', $_ENV) && $_ENV['APP_DEBUG'] !== null) {
-            $_ENV['DEBUG'] = (bool)$_ENV['APP_DEBUG'];
-        }
-
-        $this->environment = $_ENV['DEBUG'] ? 'dev' : 'prod';
-        if (array_key_exists('APP_ENV', $_ENV) && $_ENV['APP_ENV'] !== null) {
-            $this->environment = $_ENV['APP_ENV'];
-        }
-
-        $this->debug = (bool)$_ENV['DEBUG'];
+        $this->setupEnv();
 
         $this->errorHandler = new ErrorScreen(new CMain());
         $this->filesystem = new Filesystem();
@@ -300,6 +289,31 @@ public function shutdown() : void
         static::$containerBuilder = null;
     }
 
+    /**
+     * Манипуляции с переменными окружения.
+     *
+     * @return void
+     */
+    private function setupEnv() : void
+    {
+        $_ENV['DEBUG'] = $_ENV['DEBUG'] ?? false;
+        if ($_ENV['DEBUG'] !== false) {
+            if (is_string($_ENV['DEBUG'])) {
+                $_ENV['DEBUG'] = $_ENV['DEBUG'] === 'true' || $_ENV['DEBUG'] === '1';
+            } else {
+                $_ENV['DEBUG'] = (bool)$_ENV['DEBUG'];
+            }
+        }
+
+        $this->environment = $_ENV['DEBUG'] ? 'dev' : 'prod';
+
+        if (array_key_exists('APP_ENV', $_ENV) && $_ENV['APP_ENV'] !== null) {
+            $this->environment = $_ENV['APP_ENV'];
+        }
+
+        $this->debug = $_ENV['DEBUG'];
+    }
+
     /**
      * Boot.
      *
diff --git a/tests/Cases/ServiceProviderTest.php b/tests/Cases/ServiceProviderTest.php
index e246db0..c207d97 100644
--- a/tests/Cases/ServiceProviderTest.php
+++ b/tests/Cases/ServiceProviderTest.php
@@ -288,6 +288,47 @@ public function testGetPathCacheDirectory() : void
         );
     }
 
+    /**
+     * Манипуляции с $_ENV.
+     *
+     * @param mixed $envDebug Значение $_ENV['DEBUG'].
+     * @param bool  $expected Ожидаемое.
+     *
+     * @return void
+     *
+     * @throws Exception
+     * @dataProvider dataProviderEnvDebugValues
+     */
+    public function testSetEnv($envDebug, bool $expected) : void
+    {
+        $backup = $_ENV;
+        $_ENV['DEBUG'] = $envDebug;
+
+        $this->obTestObject = new ServiceProvider($this->pathYamlConfig);
+
+        $this->assertSame($_ENV['DEBUG'], $expected);
+
+        $_ENV = $backup;
+    }
+
+    /**
+     * @return array
+     */
+    public function dataProviderEnvDebugValues() : array
+    {
+        return [
+          '0-number' => [0, false],
+          '1-number' => [1, true],
+          '0-string' => ['0', false],
+          '1-string' => ['1', true],
+          'true-string' => ['true', true],
+          'false-string' => ['false', false],
+          'null-string' => [null, false],
+          'true' => [true, true],
+          'false' => [false, false],
+        ];
+    }
+
     /**
      * Рекурсивно удалить папку со всем файлами и папками.
      *