From 35704cd55b6f3451c125835605739a7f092d39a3 Mon Sep 17 00:00:00 2001
From: James Kerr <jkerr838@gmail.com>
Date: Mon, 19 Apr 2021 10:03:53 -0700
Subject: [PATCH] Check if 'of' is null

---
 zealot/enhancers/zngToZeek.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/zealot/enhancers/zngToZeek.ts b/zealot/enhancers/zngToZeek.ts
index 058e2928f7..609ebe2661 100644
--- a/zealot/enhancers/zngToZeek.ts
+++ b/zealot/enhancers/zngToZeek.ts
@@ -37,9 +37,9 @@ function replaceColumn(c: zjson.Column): zjson.Column {
   if (c.type == "array" || c.type == "set") {
     return {...c, of: replaceTypes(c.of)}
   } else if (c.type == "union") {
-    return {...c, of: c.of.map(replaceTypes)}
+    return {...c, of: (c.of || []).map(replaceTypes)}
   } else if (c.type == "record") {
-    return {...c, of: c.of.map(replaceColumn)}
+    return {...c, of: (c.of || []).map(replaceColumn)}
   } else {
     return {...c, type: getZeekPrimitive(c.type)}
   }