fix: avoid crashing in some cases

src/main.swift

@@ -1,6 +1,13 @@
 import AppKit
 import Darwin
 
+func printStackTrace() {
+    let stackSymbols = Thread.callStackSymbols
+    for symbol in stackSymbols {
+        print(symbol)
+    }
+}
+
 // - if the app is quit/force-quit from Activity Monitor, it will receive SIGTERM and applicationWillTerminate won't be called
 // - if the app crashes in swift code (e.g. unexpected nil object), SIGTRAP is sent
 // we intercept these signals, and reset the native command-tab shortcut
@@ -8,6 +15,7 @@ import Darwin
     signal($0) { s in
         setNativeCommandTabEnabled(true)
         debugPrint("Exiting after receiving signal", s)
+        printStackTrace()
         exit(0)
     }
 }
@@ -17,6 +25,7 @@ import Darwin
 NSSetUncaughtExceptionHandler { (exception) in
     setNativeCommandTabEnabled(true)
     debugPrint("Exiting after receiving uncaught NSException", exception)
+    printStackTrace()
     exit(0)
 }
 

src/ui/App.swift

@@ -183,18 +183,16 @@ class App: AppCenterApplication, NSApplicationDelegate {
         permissionsWindow.show()
     }
 
-    @objc func showFeedbackPanel() {
-        showSecondaryWindow(feedbackWindow)
-    }
-
     @objc func supportProject() {
         NSWorkspace.shared.open(URL(string: App.website + "/support")!)
     }
 
+    @objc func showFeedbackPanel() {
+        showSecondaryWindow(feedbackWindow)
+    }
+
     @objc func showPreferencesWindow() {
         showSecondaryWindow(preferencesWindow)
-        // Use the center function to continue to center, the `repositionPanel` function cannot center, it may be a system bug
-        preferencesWindow.center()
     }
 
     func showSecondaryWindow(_ window: NSWindow?) {
@@ -202,6 +200,8 @@ class App: AppCenterApplication, NSApplicationDelegate {
             NSScreen.preferred().repositionPanel(window)
             App.shared.activate(ignoringOtherApps: true)
             window.makeKeyAndOrderFront(nil)
+            // Use the center function to continue to center, the `repositionPanel` function cannot center, it may be a system bug
+            window.center()
         }
     }
 

src/ui/preferences-window/LabelAndControl.swift

@@ -260,12 +260,14 @@ class LabelAndControl: NSObject {
                 button.setWidth(segmentWidth, forSegment: i)
             }
             if #available(macOS 11.0, *) {
-                if let preference = preference as? SfSymbolMacroPreference {
-                    button.setImage(NSImage(systemSymbolName: preference.symbolName, accessibilityDescription: nil)!, forSegment: i)
+                if let preference = preference as? SfSymbolMacroPreference,
+                   let symbolImage = NSImage(systemSymbolName: preference.symbolName, accessibilityDescription: nil) {
+                    button.setImage(symbolImage, forSegment: i)
                 }
             }
-            if defaults.int(rawName) == i {
-                button.selectedSegment = i
+            let selectedSegment = defaults.int(rawName)
+            if selectedSegment >= 0 && selectedSegment < macroPreferences.count {
+                button.selectedSegment = selectedSegment
             }
             _ = setupControl(button, rawName, String(i), extraAction: extraAction)
         }