diff --git a/Class/DataReceived.cs b/Class/DataReceived.cs
index d402f68..30a8f96 100644
--- a/Class/DataReceived.cs
+++ b/Class/DataReceived.cs
@@ -57,7 +57,7 @@ namespace SunlightAggregationTerminal.Class
                 });
             }
 
-            return null; // 如果未找到有效IP则返回null
+            return ""; // 如果未找到有效IP则返回null
         }
 
         public static string ServerIP = "";
diff --git a/QueryPage.xaml.cs b/QueryPage.xaml.cs
index 44ac75f..09abe0a 100644
--- a/QueryPage.xaml.cs
+++ b/QueryPage.xaml.cs
@@ -75,7 +75,7 @@ public partial class QueryPage : ContentPage
                 }
             }            
         }
-        catch (Exception ex) {
+        catch (Exception) {
         }
     }