1 files changed, 7 insertions, 0 deletions
diff --git a/core/Application.php b/core/Application.php
index 443585ebc79..158375984d1 100644
--- a/core/Application.php
+++ b/core/Application.php
@@ -225,6 +225,13 @@ class Application extends App {
 						$subject->addHintForMissingSubject($table->getName(), 'preferences_app_key');
 					}
 				}
+
+				if ($schema->hasTable('mounts')) {
+					$table = $schema->getTable('mounts');
+					if (!$table->hasIndex('mounts_class_index')) {
+						$subject->addHintForMissingSubject($table->getName(), 'mounts_class_index');
+					}
+				}
 			}
 		);