fix: fix situations from some crash reports

src/logic/SystemPermissions.swift

@@ -68,7 +68,7 @@ class SystemPermissions {
             DispatchQueue.main.async {
                 if accessibility && screenRecording {
                     timer.invalidate()
-                    permissionsWindow.close()
+                    permissionsWindow?.close()
                     startupBlock()
                 } else {
                     if accessibility != permissionsWindow.accessibilityView.isPermissionGranted {

src/logic/events/KeyboardEvents.swift

@@ -83,8 +83,12 @@ class KeyboardEvents {
             eventsOfInterest: eventMask,
             callback: cgEventFlagsChangedHandler,
             userInfo: nil)
-        let runLoopSource = CFMachPortCreateRunLoopSource(nil, eventTap, 0)
-        CFRunLoopAddSource(CFRunLoopGetMain(), runLoopSource, .commonModes)
+        if let eventTap = eventTap {
+            let runLoopSource = CFMachPortCreateRunLoopSource(nil, eventTap, 0)
+            CFRunLoopAddSource(CFRunLoopGetMain(), runLoopSource, .commonModes)
+        } else {
+            App.app.restart()
+        }
     }
 
     private static func addGlobalHandlerIfNeeded(_ shortcut: Shortcut) {

src/logic/events/MouseEvents.swift

@@ -28,9 +28,13 @@ private func observe_() {
         eventsOfInterest: eventMask,
         callback: mouseHandler,
         userInfo: nil)
-    MouseEvents.toggle(false)
-    let runLoopSource = CFMachPortCreateRunLoopSource(nil, eventTap, 0)
-    CFRunLoopAddSource(BackgroundWork.mouseEventsThread.runLoop, runLoopSource, .commonModes)
+    if let eventTap = eventTap {
+        MouseEvents.toggle(false)
+        let runLoopSource = CFMachPortCreateRunLoopSource(nil, eventTap, 0)
+        CFRunLoopAddSource(BackgroundWork.mouseEventsThread.runLoop, runLoopSource, .commonModes)
+    } else {
+        App.app.restart()
+    }
 }
 
 private func mouseHandler(proxy: CGEventTapProxy, type: CGEventType, cgEvent: CGEvent, userInfo: UnsafeMutableRawPointer?) -> Unmanaged<CGEvent>? {