diff --git a/.gitignore b/.gitignore
index 67dd1b0..8f50208 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 composer.lock
 .phpunit.result.cache
 .DS_Store
+.phpunit.cache/
diff --git a/src/Container/Container.php b/src/Container/Container.php
index f3bda96..9501811 100644
--- a/src/Container/Container.php
+++ b/src/Container/Container.php
@@ -194,7 +194,10 @@ public function save(?string $path = null): string
     {
         $path = $path ?? $this->path ?? throw new RuntimeException('No path to save the container to.');
         $temporary = $path.'.tmp';
-        @unlink($temporary);
+
+        if (is_file($temporary)) {
+            unlink($temporary);
+        }
 
         $zip = new ZipArchive;
 
@@ -229,7 +232,7 @@ public function contents(): string
         $path = tempnam(sys_get_temp_dir(), 'asice-');
         $this->save($path);
         $bytes = (string) file_get_contents($path);
-        @unlink($path);
+        unlink($path);
 
         return $bytes;
     }
@@ -322,4 +325,4 @@ private function fetchIssuer(Certificate $certificate): ?Certificate
             return null;
         }
     }
-}
+}
\ No newline at end of file
diff --git a/src/Signature/XadesSignature.php b/src/Signature/XadesSignature.php
index f19380b..d713f6f 100644
--- a/src/Signature/XadesSignature.php
+++ b/src/Signature/XadesSignature.php
@@ -278,8 +278,9 @@ private function build(): DOMDocument
             $signedInfo->appendChild($reference);
         }
 
-        $signature->appendChild($document->createElementNS(self::DSIG, 'ds:SignatureValue', ''));
-        $this->element('SignatureValue')->setAttribute('Id', $this->signatureId.'-SIG');
+        $signatureValue = $document->createElementNS(self::DSIG, 'ds:SignatureValue', '');
+        $signatureValue->setAttribute('Id', $this->signatureId.'-SIG');
+        $signature->appendChild($signatureValue);
 
         $keyInfo = $document->createElementNS(self::DSIG, 'ds:KeyInfo');
         $keyInfo->setAttribute('Id', $this->signatureId.'-KEYINFO');
@@ -361,4 +362,4 @@ private function build(): DOMDocument
 
         return $document;
     }
-}
+}
\ No newline at end of file