diff --git a/modules/saml/lib/Auth/Source/SP.php b/modules/saml/lib/Auth/Source/SP.php
index a9e4c89b21954024b64b63e422af15682e712d8c..e9304474a2566ab20358bb967eb873d9009f50c8 100644
--- a/modules/saml/lib/Auth/Source/SP.php
+++ b/modules/saml/lib/Auth/Source/SP.php
@@ -370,7 +370,8 @@ class SP extends \SimpleSAML\Auth\Source
                     }
                     break;
                 default:
-                    $acs = [];
+                    Logger::warning('Unknown acs.Binding value specified, ignoring: ' . $service);
+                    continue 2;
             }
             $acs['index'] = $index;
             $endpoints[] = $acs;