From 136394fc46d060f52000aefb7659f2f7cc8f3ad5 Mon Sep 17 00:00:00 2001
From: Micah Osborne <micahosborne@gmail.com>
Date: Thu, 6 Jul 2023 11:47:35 -0400
Subject: [PATCH] Check for null identifier on add event.

---
 src/Marten/Events/Aggregation/TenantSliceGroup.cs | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/Marten/Events/Aggregation/TenantSliceGroup.cs b/src/Marten/Events/Aggregation/TenantSliceGroup.cs
index 601b883155..b1d6e122d3 100644
--- a/src/Marten/Events/Aggregation/TenantSliceGroup.cs
+++ b/src/Marten/Events/Aggregation/TenantSliceGroup.cs
@@ -91,13 +91,20 @@ public void AddEvents<TEvent>(Func<TEvent, IEnumerable<TId>> multipleIdSource, I
 
     public void AddEvent(TId id, IEvent @event)
     {
-        Slices[id].AddEvent(@event);
+        if (id != null)
+        {
+            Slices[id].AddEvent(@event);
+        }
+
     }
 
     public void AddEvents(TId id, IEnumerable<IEvent> events)
     {
-        Slices[id].AddEvents(events);
-    }
+        if (id != null)
+        {
+            Slices[id].AddEvents(events);
+        }
+    } 
 
     public void Dispose()
     {