From fc0ef2248c14c938e751e0c7b030659c593028b6 Mon Sep 17 00:00:00 2001
From: Simon Weinberger <mail@sweini.de>
Date: Sun, 26 Jan 2025 07:32:00 +0100
Subject: [PATCH] a single null parameter makes the whole format expression
 null (propagating error state)

---
 Yafc.Parser/Data/LocalisedStringParser.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Yafc.Parser/Data/LocalisedStringParser.cs b/Yafc.Parser/Data/LocalisedStringParser.cs
index d76cec62..87baf63f 100644
--- a/Yafc.Parser/Data/LocalisedStringParser.cs
+++ b/Yafc.Parser/Data/LocalisedStringParser.cs
@@ -140,7 +140,12 @@ internal static class LocalisedStringParser {
                     break;
                 default:
                     if (int.TryParse(type, out int idx) && idx >= 1 && idx <= parameters.Length) {
-                        result.Append(parameters[idx - 1]);
+                        string? referencedParameter = parameters[idx - 1];
+                        if (referencedParameter == null) {
+                            return null;
+                        }
+
+                        result.Append(referencedParameter);
                     }
                     else {
                         result.Append(format[start..(end + 2)]);