diff --git a/src/ui/App.swift b/src/ui/App.swift
index aa582ffd..67877d97 100644
--- a/src/ui/App.swift
+++ b/src/ui/App.swift
@@ -66,7 +66,9 @@ class App: NSApplication, NSApplicationDelegate {
 
     func hideUi() {
         debugPrint("hideUi")
-        thumbnailsPanel!.orderOut(nil)
+        DispatchQueue.main.async {
+            self.thumbnailsPanel!.orderOut(nil)
+        }
         appIsBeingUsed = false
         isFirstSummon = true
     }