diff --git a/src/get_active_window.rs b/src/get_active_window.rs
index 2aa1192..7672c5c 100644
--- a/src/get_active_window.rs
+++ b/src/get_active_window.rs
@@ -12,6 +12,8 @@
 use std::error::Error;
 use std::io::{BufRead, BufReader};
 use std::process::{Command, Stdio};
+use std::thread;
+use std::time::Duration;
 
 enum WindowTitle {
     Code,
@@ -75,47 +77,61 @@ impl WindowTitle {
 }
 
 pub fn get_active_window_process_and_title() -> Result<String, Box<dyn Error>> {
-    let xprop_output = Command::new("xprop")
-        .arg("-root")
-        .arg("_NET_ACTIVE_WINDOW")
-        .stdout(Stdio::piped())
-        .spawn()?
-        .stdout
-        .ok_or("Failed to capture xprop stdout")?;
+    let mut failure_count = 0;
 
-    let xprop_reader = BufReader::new(xprop_output);
-    let mut window_id = String::new();
-    for line in xprop_reader.lines() {
-        let line = line?;
-        if line.contains("_NET_ACTIVE_WINDOW(WINDOW)") {
-            window_id = line.split_whitespace().nth(4).unwrap_or("").to_string();
-            break;
+    loop {
+        let xprop_output = Command::new("xprop")
+            .arg("-root")
+            .arg("_NET_ACTIVE_WINDOW")
+            .stdout(Stdio::piped())
+            .spawn()?
+            .stdout
+            .ok_or("Failed to capture xprop stdout")?;
+
+        let xprop_reader = BufReader::new(xprop_output);
+        let mut window_id = String::new();
+        for line in xprop_reader.lines() {
+            let line = line?;
+            if line.contains("_NET_ACTIVE_WINDOW(WINDOW)") {
+                window_id = line.split_whitespace().nth(4).unwrap_or("").to_string();
+                break;
+            }
         }
-    }
 
-    if window_id.is_empty() {
-        return Err("Failed to get active window ID".into());
-    }
+        if window_id.is_empty() {
+            failure_count += 1;
+            if failure_count >= 3 {
+                thread::sleep(Duration::from_secs(1));
+                failure_count = 0;
+            }
+            continue;
+        }
 
-    let xprop_output = Command::new("xprop")
-        .arg("-id")
-        .arg(&window_id)
-        .arg("WM_CLASS")
-        .stdout(Stdio::piped())
-        .spawn()?
-        .stdout
-        .ok_or("Failed to capture xprop stdout")?;
+        let xprop_output = Command::new("xprop")
+            .arg("-id")
+            .arg(&window_id)
+            .arg("WM_CLASS")
+            .stdout(Stdio::piped())
+            .spawn()?
+            .stdout
+            .ok_or("Failed to capture xprop stdout")?;
 
-    let xprop_reader = BufReader::new(xprop_output);
-    for line in xprop_reader.lines() {
-        let line = line?;
-        if line.contains("WM_CLASS(STRING)") {
-            let class_name = line.split('"').nth(1).unwrap_or("");
-            println!("class_name: {}", class_name);
-            let window_title_enum = WindowTitle::from_string(class_name);
-            return Ok(window_title_enum.to_string());
+        let xprop_reader = BufReader::new(xprop_output);
+        for line in xprop_reader.lines() {
+            let line = line?;
+            if line.contains("WM_CLASS(STRING)") {
+                let class_name = line.split('"').nth(1).unwrap_or("");
+                println!("class_name: {}", class_name);
+                let window_title_enum = WindowTitle::from_string(class_name);
+                return Ok(window_title_enum.to_string());
+            }
         }
-    }
 
-    Err("Failed to get window class".into())
+        failure_count += 1;
+        if failure_count >= 3 {
+            thread::sleep(Duration::from_secs(1));
+            println!("It seems that the window is not found or it's not a valid window (Terminal).");
+            failure_count = 0;
+        }
+    }
 }