From 8517a28b5755550c28d1bf2c42e6b14e63d2eba9 Mon Sep 17 00:00:00 2001
From: tschumpr <roswita.tschuemperlin@geowerkstatt.ch>
Date: Thu, 12 Dec 2024 15:11:48 +0100
Subject: [PATCH] Show corret message if layer is missing

---
 Geodatenbezug/Processors/TopicProcessor.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Geodatenbezug/Processors/TopicProcessor.cs b/Geodatenbezug/Processors/TopicProcessor.cs
index 64510ba..d70d4e1 100644
--- a/Geodatenbezug/Processors/TopicProcessor.cs
+++ b/Geodatenbezug/Processors/TopicProcessor.cs
@@ -223,6 +223,10 @@ public GdalLayer CreateGdalLayer(string layerName, Dictionary<string, FieldDefn>
     {
         var inputLayer = InputDataSource.GetLayerByName(layerName);
 
+        if (inputLayer == null) {
+            throw new InvalidOperationException($"Layer {layerName} not found in input data source");
+        }
+
         // Workaround https://github.com/blw-ofag-ufag/geodatenbezug_geodienste/issues/45
         var geometryType = inputLayer.GetNextFeature().GetGeometryRef().GetGeometryType();