diff --git a/inc/inc.ClassAuthenticationService.php b/inc/inc.ClassAuthenticationService.php
index 41119877a..f04ac304d 100644
--- a/inc/inc.ClassAuthenticationService.php
+++ b/inc/inc.ClassAuthenticationService.php
@@ -66,7 +66,8 @@ class SeedDMS_AuthenticationService {
 	public function authenticate($username, $password) { /* {{{ */
 		$user = null;
 		foreach($this->services as $name => $service) {
-			$this->logger->log('Authentication service \''.$name.'\'', PEAR_LOG_INFO);
+			if($this->logger)
+				$this->logger->log('Authentication service \''.$name.'\'', PEAR_LOG_INFO);
 			$user = $service->authenticate($username, $password);
 			if($user === false) {
 				$this->errors[$name] = false;