try to fix error: Can’t get window 1 of process . Invalid index

app/get-foreground-window-title.osa

@@ -1,13 +1,15 @@
 global frontApp, frontAppName, windowTitle
- set windowTitle to ""
+ global frontApp, frontAppName, windowTitle
 
+ set windowTitle to ""
  tell application "System Events"
-
- set frontApp to first application process whose frontmost is true
- set frontAppName to name of frontApp
-
- tell process frontAppName
- set windowTitle to title of 1st window
- end tell
+     set frontApp to first application process whose frontmost is true
+     set frontAppName to name of frontApp
+     tell process frontAppName
+         tell (1st window whose value of attribute "AXMain" is true)
+             set windowTitle to value of attribute "AXTitle"
+         end tell
+     end tell
  end tell
+
  return {frontAppName, windowTitle, frontApp}

app/testscript.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+for i in `seq 1 5`;
+  do
+	echo $i
+	echo `osascript get-foreground-window-title.osa`
+	sleep 1
+done