diff --git a/Radzen.Blazor/CartesianSeries.cs b/Radzen.Blazor/CartesianSeries.cs
index 7cdd3f95113..03c27187192 100644
--- a/Radzen.Blazor/CartesianSeries.cs
+++ b/Radzen.Blazor/CartesianSeries.cs
@@ -533,7 +533,7 @@ public virtual RenderFragment RenderSharedTooltipItem(object category)
         {
             return builder =>
             {
-                var item = Items.FirstOrDefault(i => PropertyAccess.GetValue(i, CategoryProperty) == category);
+                var item = Items.FirstOrDefault(i => object.Equals(PropertyAccess.GetValue(i, CategoryProperty), category));
 
                 if (item != null)
                 {