Fix "PHP Fatal error: Cannot break/continue 1 level" when ldap_start_tls() fails

program/lib/Roundcube/rcube_ldap_generic.php

@@ -175,9 +175,11 @@ class rcube_ldap_generic
         $this->_debug("C: Connect to $hostname [{$this->config['name']}]");
 
         if ($lc = @ldap_connect($host, $this->config['port'])) {
-            if ($this->config['use_tls'] === true)
+            if ($this->config['use_tls'] === true) {
-                if (!ldap_start_tls($lc))
+                if (!ldap_start_tls($lc)) {
-                    continue;
+                    return false;
+                }
+            }
 
             $this->_debug("S: OK");