From 57c8e5f6a342b08ac3b9e8768f34b6aa80cd4744 Mon Sep 17 00:00:00 2001
From: Sebastian <sebastian@squidex.io>
Date: Wed, 26 Feb 2020 10:51:27 +0100
Subject: [PATCH] Fix null ref issue.

---
 .../Contents/ContentHistoryEventsCreator.cs                  | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/backend/src/Squidex.Domain.Apps.Entities/Contents/ContentHistoryEventsCreator.cs b/backend/src/Squidex.Domain.Apps.Entities/Contents/ContentHistoryEventsCreator.cs
index 243dbdf0f..b2e9c4904 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Contents/ContentHistoryEventsCreator.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Contents/ContentHistoryEventsCreator.cs
@@ -52,6 +52,11 @@ namespace Squidex.Domain.Apps.Entities.Contents
 
             if (@event.Payload is SchemaEvent schemaEvent)
             {
+                if (schemaEvent.SchemaId == null)
+                {
+                    return Task.FromResult<HistoryEvent?>(null);
+                }
+
                 result = result.Param("Schema", schemaEvent.SchemaId.Name);
             }