diff --git a/src/Command/MinifyAssetCommand.php b/src/Command/MinifyAssetCommand.php
index ae3c46a..3d593ed 100644
--- a/src/Command/MinifyAssetCommand.php
+++ b/src/Command/MinifyAssetCommand.php
@@ -82,8 +82,8 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 
             return Command::FAILURE;
         }
-        /** @var string $inputArg */
-        $inputArg = file_get_contents($inputArg);
+        /** @var string $inputContent */
+        $inputContent = file_get_contents($inputArg);
 
         /** @var string|null $outputArg */
         $outputArg = $input->getArgument('output');
@@ -94,7 +94,19 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         /** @var 'css'|'js' $typeArg */
         $typeArg = $input->getOption('type') ?? pathinfo($inputArg, PATHINFO_EXTENSION);
 
-        $output = $this->minifier->minify($inputArg, $typeArg);
+        if (!in_array($typeArg, [MinifierInterface::TYPE_CSS, MinifierInterface::TYPE_JS], true)) {
+            $io->error(sprintf(
+                'The type of "%s" is "%s", it must be "%s" or "%s".',
+                $inputArg,
+                $typeArg,
+                MinifierInterface::TYPE_CSS,
+                MinifierInterface::TYPE_JS,
+            ));
+
+            return Command::FAILURE;
+        }
+
+        $output = $this->minifier->minify($inputContent, $typeArg);
 
         if (null === $outputArg) {
             $io->text($output);
diff --git a/tests/Command/MinifyAssetCommandTest.php b/tests/Command/MinifyAssetCommandTest.php
index fef4759..2a7fc57 100644
--- a/tests/Command/MinifyAssetCommandTest.php
+++ b/tests/Command/MinifyAssetCommandTest.php
@@ -65,6 +65,18 @@ public function testMinifyAssetCommandFailsWhenInputFileDoesNotExist(): void
         $this->assertStringContainsString('Cannot read file', $tester->getDisplay());
     }
 
+    public function testMinifyAssetCommandFailsWhenInputFileIsNotCssOrJS(): void
+    {
+        $minifier = $this->createMock(MinifierInterface::class);
+
+        $command = new MinifyAssetCommand($minifier, __DIR__.'/../Fixtures');
+        $tester = new CommandTester($command);
+
+        $tester->execute(['input' => 'bin/fakify']);
+        $this->assertSame(Command::FAILURE, $tester->getStatusCode());
+        $this->matchesRegularExpression('#[ERROR] The type of "(.*)bin/fakify" is "", it must be "css" or "js".#', $tester->getDisplay());
+    }
+
     public function testMinifyAssetCommandFailsWhenOutputFileIsNotWritable(): void
     {
         $minifier = $this->createMock(MinifierInterface::class);