diff --git a/libs/hbb_common/src/config.rs b/libs/hbb_common/src/config.rs
index 23576d98f..d248f0c28 100644
--- a/libs/hbb_common/src/config.rs
+++ b/libs/hbb_common/src/config.rs
@@ -76,7 +76,7 @@ pub struct Config {
     keys_confirmed: HashMap<String, bool>,
 }
 
-#[derive(Debug, Default, Serialize, Deserialize, Clone)]
+#[derive(Debug, Default, PartialEq, Serialize, Deserialize, Clone)]
 pub struct Socks5Server {
     #[serde(default)]
     pub proxy: String,
@@ -502,6 +502,9 @@ impl Config {
 
     pub fn set_key_pair(pair: (Vec<u8>, Vec<u8>)) {
         let mut config = CONFIG.write().unwrap();
+        if config.key_pair == pair {
+            return;
+        }
         config.key_pair = pair;
         config.store();
     }
@@ -534,6 +537,9 @@ impl Config {
 
     pub fn set_options(v: HashMap<String, String>) {
         let mut config = CONFIG2.write().unwrap();
+        if config.options == v {
+            return;
+        }
         config.options = v;
         config.store();
     }
@@ -636,6 +642,9 @@ impl Config {
 
     pub fn set_socks(socks: Option<Socks5Server>) {
         let mut config = CONFIG2.write().unwrap();
+        if config.socks == socks {
+            return;
+        }
         config.socks = socks;
         config.store();
     }
diff --git a/src/ui/ab.tis b/src/ui/ab.tis
index 6cdd496e0..22dc17f3d 100644
--- a/src/ui/ab.tis
+++ b/src/ui/ab.tis
@@ -287,4 +287,4 @@ class MultipleSessions: Reactor.Component {
     }
 }
 
-view.on("size", function() { if (app.multipleSessions) app.multipleSessions.onSize(); });
\ No newline at end of file
+view.on("size", function() { if (app && app.multipleSessions) app.multipleSessions.onSize(); });