From 52ba2dcc158de2668948e25aa3b71dc7b421a0ac Mon Sep 17 00:00:00 2001
From: alexyzhao24 <alex.y.zhao.24@gmail.com>
Date: Sun, 15 Feb 2026 16:18:59 -0500
Subject: [PATCH] Fixed recursion error in HeaderClock by restricting refresh
 to the active screen

---
 src/textual/widgets/_header.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/textual/widgets/_header.py b/src/textual/widgets/_header.py
index 1656a5730c..94d24d75af 100644
--- a/src/textual/widgets/_header.py
+++ b/src/textual/widgets/_header.py
@@ -89,7 +89,11 @@ class HeaderClock(HeaderClockSpace):
     time_format: Reactive[str] = Reactive("%X")
 
     def _on_mount(self, _: Mount) -> None:
-        self.set_interval(1, callback=self.refresh, name="update header clock")
+        def check_and_refresh() -> None:
+            if self.screen is self.app.screen:
+                print("active clock ticks") #temp, REMOVE LATER
+                self.refresh()
+        self.set_interval(1,callback=check_and_refresh,name="update header clock")
 
     def render(self) -> RenderResult:
         """Render the header clock.