null element will not cause error (gkz/grasp#127)

gratex · Sep 2, 2019 · 4c8d13f · 4c8d13f
1 parent dc24c0c
commit 4c8d13f
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diff --git a/lib/common.js b/lib/common.js
diff --git a/src/common.ls b/src/common.ls
@@ -21,6 +21,9 @@
   @types = types
 
 !function visit-pre ast, fn, path
+  if not ast
+    return
+
   fn ast, path
 
   if not syntax-flat[ast.type]?