From 21f9fff33f2ae686f4a657983f4df1ba84f2c306 Mon Sep 17 00:00:00 2001
From: Jan-Willem de Bruyn <jan.willem.de.bruyn@avivasolutions.nl>
Date: Thu, 21 May 2026 08:40:44 +0200
Subject: [PATCH] Dapper do not return any items when filtering on an empty
 array

---
 .../Extensions/ParameterizedQueryBuilderExtensions.cs    | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/modules/persistence/Elsa.Persistence.Dapper/Extensions/ParameterizedQueryBuilderExtensions.cs b/src/modules/persistence/Elsa.Persistence.Dapper/Extensions/ParameterizedQueryBuilderExtensions.cs
index 5f18e70a..c6ccc98f 100644
--- a/src/modules/persistence/Elsa.Persistence.Dapper/Extensions/ParameterizedQueryBuilderExtensions.cs
+++ b/src/modules/persistence/Elsa.Persistence.Dapper/Extensions/ParameterizedQueryBuilderExtensions.cs
@@ -184,6 +184,7 @@ public static ParameterizedQuery WorkflowDefinitionSearchTerm(this Parameterized
     /// <summary>
     /// Appends an AND clause to the query if the value is not null.
     /// </summary>
+    /// <remarks>If the values field is empty but not null, this adds an always false filter.</remarks>
     /// <param name="query">The query.</param>
     /// <param name="field">The field.</param>
     /// <param name="values">The values.</param>
@@ -191,7 +192,13 @@ public static ParameterizedQuery In(this ParameterizedQuery query, string field,
     {
         var valueList = values?.ToList();
 
-        if (valueList == null || !valueList.Any()) return query;
+        if (valueList == null) return query;
+
+        if (valueList.Count == 0)
+        {
+            query.Sql.AppendLine("and 1=0");
+            return query;
+        }
 
         var fieldParamNames = valueList
             .Select((_, index) => $"@{field}{index}")