diff --git a/src/runner/instance.rs b/src/runner/instance.rs
index 222201a..0b9bb64 100644
--- a/src/runner/instance.rs
+++ b/src/runner/instance.rs
@@ -267,12 +267,11 @@ impl mlua::UserData for Instance{
 						database:db,
 						descriptor:Some(class),
 					};
-					iter.find_map(|class|
-						cf.get_or_create_class_methods(&class.name)
-							.and_then(|mut class_methods|
-								class_methods.get_or_create_function(lua,index_str).transpose()
-							)
-					).transpose()
+					iter.find_map(|class|{
+						let mut class_methods=cf.get_or_create_class_methods(&class.name)?;
+						class_methods.get_or_create_function(lua,index_str)
+							.transpose()
+					}).transpose()
 				})?{
 					return function.into_lua(lua);
 				}