diff --git a/.vscode/launch.json b/.vscode/launch.json
index cb2fcbe..bed8f13 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -9,6 +9,12 @@
       "type": "dotnet",
       "request": "launch",
       "projectPath": "${workspaceFolder}/src/server/host/MinigolfFriday.Host.csproj"
+    },
+    {
+      "name": "C#: Host Attach",
+      "type": "coreclr",
+      "request": "attach",
+      "processName": "MinigolfFriday.Host.exe"
     }
   ]
 }
diff --git a/src/server/host/Endpoints/Events/UpdatePlayerEventRegistrationsEndpoint.cs b/src/server/host/Endpoints/Events/UpdatePlayerEventRegistrationsEndpoint.cs
index 8855a6e..9d427e5 100644
--- a/src/server/host/Endpoints/Events/UpdatePlayerEventRegistrationsEndpoint.cs
+++ b/src/server/host/Endpoints/Events/UpdatePlayerEventRegistrationsEndpoint.cs
@@ -145,7 +145,7 @@ await this.SendErrorAsync(
             }
             else
             {
-                existing.FallbackEventTimeslot = fallbackTimeslot;
+                existing.FallbackEventTimeslotId = fallbackTimeslot?.Id;
             }
         }
         await databaseContext.SaveChangesAsync(ct);