From cedc8873a6a92c2a2d7adcbf42b5178fa7f2ea3b Mon Sep 17 00:00:00 2001
From: Sipke Schoorstra <sipkeschoorstra@outlook.com>
Date: Sun, 19 Sep 2021 13:46:50 +0200
Subject: [PATCH] Update SignalReceivedBookmarkProvider.cs

Fixes #1375
---
 .../SignalReceived/SignalReceivedBookmarkProvider.cs        | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/core/Elsa.Core/Activities/Signaling/Activities/SignalReceived/SignalReceivedBookmarkProvider.cs b/src/core/Elsa.Core/Activities/Signaling/Activities/SignalReceived/SignalReceivedBookmarkProvider.cs
index 65023d43f..e987d9148 100644
--- a/src/core/Elsa.Core/Activities/Signaling/Activities/SignalReceived/SignalReceivedBookmarkProvider.cs
+++ b/src/core/Elsa.Core/Activities/Signaling/Activities/SignalReceived/SignalReceivedBookmarkProvider.cs
@@ -20,7 +20,11 @@ namespace Elsa.Activities.Signaling
 
         private async IAsyncEnumerable<BookmarkResult> GetBookmarksInternalAsync(BookmarkProviderContext<SignalReceived> context, [EnumeratorCancellation] CancellationToken cancellationToken)
         {
-            var signalName = (await context.ReadActivityPropertyAsync(x => x.Signal, cancellationToken))!.ToLowerInvariant();
+            var signalName = (await context.ReadActivityPropertyAsync(x => x.Signal, cancellationToken))?.ToLowerInvariant().Trim();
+            
+            // Can't do anything with an empty signal name.
+            if(string.IsNullOrEmpty(signalName))
+                yield break;
             
             yield return Result(new SignalReceivedBookmark
             {