diff --git a/apps/dav/lib/Connector/PublicAuth.php b/apps/dav/lib/Connector/PublicAuth.php
index cc51a249e75..fb952a8a995 100644
--- a/apps/dav/lib/Connector/PublicAuth.php
+++ b/apps/dav/lib/Connector/PublicAuth.php
@@ -61,7 +61,7 @@ class PublicAuth extends AbstractBasic {
 
 		// setup realm
 		$defaults = new \OCP\Defaults();
-		$this->realm = $defaults->getName();
+		$this->realm = $defaults->getName() ?: 'Nextcloud';
 	}
 
 	/**
diff --git a/apps/dav/lib/Connector/Sabre/Auth.php b/apps/dav/lib/Connector/Sabre/Auth.php
index 69e3946bb11..d0c309651cd 100644
--- a/apps/dav/lib/Connector/Sabre/Auth.php
+++ b/apps/dav/lib/Connector/Sabre/Auth.php
@@ -76,7 +76,7 @@ class Auth extends AbstractBasic {
 
 		// setup realm
 		$defaults = new \OCP\Defaults();
-		$this->realm = $defaults->getName();
+		$this->realm = $defaults->getName() ?: 'Nextcloud';
 	}
 
 	/**
diff --git a/apps/dav/lib/Connector/Sabre/BearerAuth.php b/apps/dav/lib/Connector/Sabre/BearerAuth.php
index 5a69d07b002..b38600bd944 100644
--- a/apps/dav/lib/Connector/Sabre/BearerAuth.php
+++ b/apps/dav/lib/Connector/Sabre/BearerAuth.php
@@ -47,7 +47,7 @@ class BearerAuth extends AbstractBearer {
 
 		// setup realm
 		$defaults = new \OCP\Defaults();
-		$this->realm = $defaults->getName();
+		$this->realm = $defaults->getName() ?: 'Nextcloud';
 	}
 
 	private function setupUserFs($userId) {