diff --git a/cli/Valet/PhpFpm.php b/cli/Valet/PhpFpm.php
index 990a373..28c0933 100644
--- a/cli/Valet/PhpFpm.php
+++ b/cli/Valet/PhpFpm.php
@@ -324,7 +324,7 @@ public function symlinkPrimaryValetSock($phpVersion)
      */
     public function normalizePhpVersion($version)
     {
-        return preg_replace('/(?:php@?)?([0-9+])(?:.)?([0-9+])/i', 'php@$1.$2', $version);
+        return preg_replace('/(?:php@?)?([0-9+])(?:.)?([0-9+])/i', 'php@$1.$2', (string) $version);
     }
 
     /**
diff --git a/tests/PhpFpmTest.php b/tests/PhpFpmTest.php
index 0258861..b9bfc4f 100644
--- a/tests/PhpFpmTest.php
+++ b/tests/PhpFpmTest.php
@@ -63,6 +63,8 @@ public function test_it_normalizes_php_versions()
         $this->assertEquals('php@8.1', resolve(PhpFpm::class)->normalizePhpVersion('php81'));
         $this->assertEquals('php@8.1', resolve(PhpFpm::class)->normalizePhpVersion('8.1'));
         $this->assertEquals('php@8.1', resolve(PhpFpm::class)->normalizePhpVersion('81'));
+        $this->assertEquals('', resolve(PhpFpm::class)->normalizePhpVersion(''));
+        $this->assertEquals('', resolve(PhpFpm::class)->normalizePhpVersion(null));
     }
 
     public function test_it_validates_php_versions_when_installed()