diff --git a/JsonLogic.Net.UnitTests/JsonLogicTests.cs b/JsonLogic.Net.UnitTests/JsonLogicTests.cs
index 177257c..96c1d3c 100644
--- a/JsonLogic.Net.UnitTests/JsonLogicTests.cs
+++ b/JsonLogic.Net.UnitTests/JsonLogicTests.cs
@@ -89,8 +89,8 @@ public JsonLogicTests(ITestOutputHelper output)
         [InlineData("{`>`: [3, 4, 1]}", false)]
         [InlineData("{`>=`: [3, 2, 1]}", true)]
         [InlineData("{`>=`: [3, 1, 1]}", true)]
-        [InlineData("{`>=`: [3, 4, 1]}", false)]
-
+        [InlineData("{`>=`: [3, 4, 1]}", false)]
+
         [InlineData("{`<`: [`2020-01-31`, `2020-02-01`, `2020-02-02`]}", true)]
         [InlineData("{`<`: [`2020-01-31`, `2020-02-02`, `2020-02-02`]}", false)]
         [InlineData("{`<`: [`2020-01-31`, `2020-02-03`, `2020-02-02`]}", false)]
@@ -148,6 +148,9 @@ public JsonLogicTests(ITestOutputHelper output)
         [InlineData("{`in`: [`Spring`, `Springfield`]}", true)]
         [InlineData("{`in`: [`Springs`, `Springfield`]}", false)]
         [InlineData("{`in`: [`spring`, `Springfield`]}", false)]
+        
+        [InlineData("{`in`:[`/homePage`,{`var`:`page.url`}]}", false)]
+        
         [InlineData("{`cat`: [`spring`, `field`]}", "springfield")]
         [InlineData("{`substr`: [`springfield`, 6]}", "field")]
         [InlineData("{`substr`: [`springfield`, 6, 3]}", "fie")]
diff --git a/JsonLogic.Net/EvaluateOperators.cs b/JsonLogic.Net/EvaluateOperators.cs
index 01ca0c4..5d2e494 100644
--- a/JsonLogic.Net/EvaluateOperators.cs
+++ b/JsonLogic.Net/EvaluateOperators.cs
@@ -227,6 +227,7 @@ private void AddDefaultOperations()
             AddOperator("in", (p, args, data) => {
                 object needle = p.Apply(args[0], data);
                 object haystack = p.Apply(args[1], data);
+                if (haystack is null) return false;
                 if (haystack is String) return (haystack as string).IndexOf(needle.ToString()) >= 0;
 
                 return haystack.MakeEnumerable().Any(item => item.EqualTo(needle));