diff --git a/main.js b/main.js
index 652a83e..d8b0b1f 100644
--- a/main.js
+++ b/main.js
@@ -137,7 +137,7 @@ function objectToTable(o) {
   // TODO: hack hack hack
   let table = `<table style="margin: 0.5em; border-collapse: collapse;">`;
   for (let [key, value] of Object.entries(o)) {
-    if (typeof value === "object") {
+    if (typeof value === "object" && value !== null) {
       value = objectToTable(value);
     }
     if (typeof value === "string" && /^https?:\/\//.test(value)) {