diff --git a/Plugins/Flow.Launcher.Plugin.Calculator/Main.cs b/Plugins/Flow.Launcher.Plugin.Calculator/Main.cs
index 5b23ceacc30..ab8ce892a7f 100644
--- a/Plugins/Flow.Launcher.Plugin.Calculator/Main.cs
+++ b/Plugins/Flow.Launcher.Plugin.Calculator/Main.cs
@@ -32,7 +32,13 @@ public class Main : IPlugin, IPluginI18n, ISavable, ISettingProvider
 
         static Main()
         {
-            MagesEngine = new Engine();
+            MagesEngine = new Engine(new Configuration
+            {
+                Scope = new Dictionary<string, object>
+                {
+                    { "e", Math.E }, // e is not contained in the default mages engine
+                }
+            });
         }
 
         public void Init(PluginInitContext context)
@@ -55,7 +61,7 @@ public List<Result> Query(Query query)
                 var expression = query.Search.Replace(",", ".");
                 var result = MagesEngine.Interpret(expression);
 
-                if (result.ToString() == "NaN")
+                if (result?.ToString() == "NaN")
                     result = Context.API.GetTranslation("flowlauncher_plugin_calculator_not_a_number");
 
                 if (result is Function)
diff --git a/Plugins/Flow.Launcher.Plugin.Calculator/plugin.json b/Plugins/Flow.Launcher.Plugin.Calculator/plugin.json
index 7d9ca58d58f..9bf532e8791 100644
--- a/Plugins/Flow.Launcher.Plugin.Calculator/plugin.json
+++ b/Plugins/Flow.Launcher.Plugin.Calculator/plugin.json
@@ -4,7 +4,7 @@
   "Name": "Calculator",
   "Description": "Provide mathematical calculations.(Try 5*3-2 in Flow Launcher)",
   "Author": "cxfksword",
-  "Version": "1.1.4",
+  "Version": "1.1.5",
   "Language": "csharp",
   "Website": "https://github.com/Flow-Launcher/Flow.Launcher",
   "ExecuteFileName": "Flow.Launcher.Plugin.Caculator.dll",