[BUGFIX] Add fallback if executed via composer's xdebug-handler

packages/bluecontainer/src/Composer/Plugin.php

@@ -9,6 +9,7 @@
 use Symfony\Component\Process\Process;
 
 use function CoStack\Lib\concat_paths;
+use function getcwd;
 use function str_ends_with;
 
 class Plugin implements PluginInterface, EventSubscriberInterface
@@ -45,7 +46,7 @@ public function postAutoloadDump(): void
     {
         $this->io->write('Generating container');
 
-        $binary = $_ENV['_'];
+        $binary = $_ENV['_'] ?? '';
         if (!str_ends_with($binary, 'php')) {
             $binary = 'php';
         }
@@ -57,7 +58,7 @@ public function postAutoloadDump(): void
         $cmd[] = $binary;
         $cmd[] = $blueContainerBinary;
         $cmd[] = 'compile';
-        $process = new Process($cmd, $_ENV['PWD'], $_ENV, null, 60 * 60);
+        $process = new Process($cmd, $_ENV['PWD'] ?? getcwd(), $_ENV, null, 60 * 60);
         $process->run();
         if (!$process->isSuccessful()) {
             $this->io->writeError('Failed generating DI container');