diff --git a/src/modules/Elsa.Workflows.Api/Endpoints/WorkflowDefinitions/Export/Models.cs b/src/modules/Elsa.Workflows.Api/Endpoints/WorkflowDefinitions/Export/Models.cs
index baa9ab67c..f33b38612 100644
--- a/src/modules/Elsa.Workflows.Api/Endpoints/WorkflowDefinitions/Export/Models.cs
+++ b/src/modules/Elsa.Workflows.Api/Endpoints/WorkflowDefinitions/Export/Models.cs
@@ -19,5 +19,5 @@ internal class Request
     /// <summary>
     /// A list of workflow definition version IDs.
     /// </summary>
-    public ICollection<string> Ids { get; set; } = default!;
+    public ICollection<string>? Ids { get; set; } = default!;
 }
\ No newline at end of file
diff --git a/src/modules/Elsa.Workflows.Runtime/Services/TriggerIndexer.cs b/src/modules/Elsa.Workflows.Runtime/Services/TriggerIndexer.cs
index 57c1f2e80..5f91f6232 100644
--- a/src/modules/Elsa.Workflows.Runtime/Services/TriggerIndexer.cs
+++ b/src/modules/Elsa.Workflows.Runtime/Services/TriggerIndexer.cs
@@ -210,7 +210,7 @@ public class TriggerIndexer : ITriggerIndexer
         return triggers.ToList();
     }
 
-    private async Task<ICollection<object>> TryGetTriggerDataAsync(ITrigger trigger, TriggerIndexingContext context)
+    private async Task<List<object>> TryGetTriggerDataAsync(ITrigger trigger, TriggerIndexingContext context)
     {
         try
         {
@@ -221,6 +221,6 @@ public class TriggerIndexer : ITriggerIndexer
             _logger.LogWarning(e, "Failed to get trigger data for activity {ActivityId}", trigger.Id);
         }
 
-        return Array.Empty<object>();
+        return new List<object>(0);
     }
 }
\ No newline at end of file