fix crashes caused by code errors

2 files changed, 5 insertions, 3 deletions

diff --git a/registry.moon b/registry.moon
index 2a751cc..7268f6d 100644
--- a/registry.moon
+++ b/registry.moon
@@ -96,8 +96,10 @@ class Registry
   update: (dt) =>
     for typ, sexpr in @root\walk 'inout', false
       continue unless typ == 'Xpr'
-      -- continue unless sexpr.value and sexpr.value.update
-      continue unless sexpr\head!.type == 'opdef'
+
+      head = sexpr\head!
+      continue unless head and head.type == 'opdef'
+      continue unless sexpr.value
 
       ok, err = xpcall sexpr.value.update, tb, sexpr.value, dt
       if not ok
diff --git a/scope.moon b/scope.moon
index 907269e..bba2db4 100644
--- a/scope.moon
+++ b/scope.moon
@@ -60,7 +60,7 @@ class Scope
     start, rest = key\match '^(.-)/(.*)'
 
     if not start
-      return @parent\get key
+      return @parent and @parent\get key
 
     scope = @get start
     assert scope and scope.type == 'scope', "cant find '#{prefix}#{start}' for '#{prefix}#{key}'"