From dcc93f75fc173baf1f70683454cdadf54cfe538a Mon Sep 17 00:00:00 2001
From: Thomas Lynch <tom@69420.me>
Date: Sun, 23 Aug 2020 10:16:24 +0000
Subject: [PATCH] Bugfix impossible grid captcha references #209

---
 helpers/captcha/generators/grid.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/helpers/captcha/generators/grid.js b/helpers/captcha/generators/grid.js
index dc0d711d..81a35e8f 100644
--- a/helpers/captcha/generators/grid.js
+++ b/helpers/captcha/generators/grid.js
@@ -29,6 +29,9 @@ module.exports = async () => {
 	const randBuffer = await randomBytes(numInputs);
 	//array of true/false, for each grid input
 	const boolArray = Array.from(randBuffer).map(x => x < 80);
+	if (!boolArray.some(b => b === true)) {
+		boolArray[(await randomRange(0,numInputs))] = true;
+	}
 
 	const captchaId = await Captchas.insertOne(boolArray).then(r => r.insertedId);