diff --git a/video/out/cocoa-cb/events_view.swift b/video/out/cocoa-cb/events_view.swift
index 7cc295f362..5a84d27b2b 100644
--- a/video/out/cocoa-cb/events_view.swift
+++ b/video/out/cocoa-cb/events_view.swift
@@ -233,7 +233,7 @@ class EventsView: NSView {
             topMargin = cocoaCB.window.titleBarHeight + 1 + menuBarHeight
         }
 
-        var vF = window!.screen!.frame
+        guard var vF = window?.screen?.frame else { return false }
         vF.size.height -= topMargin
 
         let vFW = window!.convertFromScreen(vF)