diff --git a/lib/Service/Install/InstallService.php b/lib/Service/Install/InstallService.php
index b0124e1237..d3acf72147 100644
--- a/lib/Service/Install/InstallService.php
+++ b/lib/Service/Install/InstallService.php
@@ -326,7 +326,7 @@ public function setResource(string $resource): self {
 	public function installJava(?bool $async = false): void {
 		$signatureEngine = $this->appConfig->getAppValue('signature_engine', 'jsignpdf');
 		if ($signatureEngine !== 'jsignpdf') {
-			return [];
+			return;
 		}
 		$this->setResource('java');
 		if ($async) {
@@ -400,7 +400,7 @@ public function uninstallJava(): void {
 	public function installJSignPdf(?bool $async = false): void {
 		$signatureEngine = $this->appConfig->getAppValue('signature_engine', 'jsignpdf');
 		if ($signatureEngine !== 'jsignpdf') {
-			return [];
+			return;
 		}
 		if (!extension_loaded('zip')) {
 			throw new RuntimeException('Zip extension is not available');