From 5f90a80fe3c1578d2baa2d557bf1483d090685d8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tam=C3=A1s=20B=C3=A1lint=20Misius?= <lbphacker@gmail.com>
Date: Thu, 15 Jul 2021 21:05:24 +0200
Subject: [PATCH] Disallow GOL rulesets with no B states

---
 src/simulation/GOLString.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/simulation/GOLString.cpp b/src/simulation/GOLString.cpp
index 405255de3..859bd0ed4 100644
--- a/src/simulation/GOLString.cpp
+++ b/src/simulation/GOLString.cpp
@@ -13,6 +13,10 @@ int ParseGOLString(const String &value)
 	{
 		begin |= 1U << (it[0] - '0');
 	}
+	if (!begin)
+	{
+		return -1;
+	}
 
 	// Must have a /S immediately afterwards
 	if (it < value.end() - 1 && it[0] == '/' && it[1] == 'S')