diff --git a/apps/encryption/lib/hookmanager.php b/apps/encryption/lib/hookmanager.php
index e2b03d91bc8..19ee142a622 100644
--- a/apps/encryption/lib/hookmanager.php
+++ b/apps/encryption/lib/hookmanager.php
@@ -42,8 +42,9 @@ class HookManager {
 				$this->hookInstances[] = $instance;
 			}
 
+		} elseif ($instances instanceof IHook) {
+			$this->hookInstances[] = $instances;
 		}
-		$this->hookInstances[] = $instances;
 		return true;
 	}