diff --git a/Folders/Views/InteractiveCollectionView.swift b/Folders/Views/InteractiveCollectionView.swift
index 8b83523..d8ce0dc 100644
--- a/Folders/Views/InteractiveCollectionView.swift
+++ b/Folders/Views/InteractiveCollectionView.swift
@@ -78,6 +78,11 @@ class InteractiveCollectionView: NSCollectionView {
 
     override func mouseDown(with event: NSEvent) {
 
+        // Ignore events if we're not the key window.
+        guard (self.window?.isKeyWindow ?? false) else {
+            return
+        }
+
         window?.makeFirstResponder(self)
 
         let position = self.convert(event.locationInWindow, from: nil)
@@ -170,6 +175,12 @@ class InteractiveCollectionView: NSCollectionView {
     }
 
     override func mouseUp(with event: NSEvent) {
+
+        // Ignore events if we're not the key window.
+        guard (self.window?.isKeyWindow ?? false) else {
+            return
+        }
+
         super.mouseUp(with: event)
 
         // Handle double-click.