diff --git a/apps/encryption/lib/session.php b/apps/encryption/lib/session.php
index 82c7829ecbd83820e950fd24dbd62cc1abd49509..e705611fa6e51b992d54ded5254306eff0567376 100644
--- a/apps/encryption/lib/session.php
+++ b/apps/encryption/lib/session.php
@@ -70,7 +70,7 @@ class Session {
 	public function getPrivateKey() {
 		$key = $this->session->get('privateKey');
 		if (is_null($key)) {
-			throw new Exceptions\PrivateKeyMissingException('no private key stored in session', 0);
+			throw new Exceptions\PrivateKeyMissingException('please try to log-out and log-in again', 0);
 		}
 		return $key;
 	}