diff --git a/web/src/pages/desktop/mouse/absolute.tsx b/web/src/pages/desktop/mouse/absolute.tsx
index ace7b3e..74357e6 100644
--- a/web/src/pages/desktop/mouse/absolute.tsx
+++ b/web/src/pages/desktop/mouse/absolute.tsx
@@ -234,7 +234,7 @@ export const Absolute = () => {
         longPressTimerRef.current = null;
       }
 
-      if (pressedButtonRef.current) {
+      if (pressedButtonRef.current !== null) {
         handleMouseEvent({ type: 'mouseup', button: pressedButtonRef.current! });
       }
 
diff --git a/web/src/pages/desktop/mouse/relative.tsx b/web/src/pages/desktop/mouse/relative.tsx
index a09f816..ac0bafa 100644
--- a/web/src/pages/desktop/mouse/relative.tsx
+++ b/web/src/pages/desktop/mouse/relative.tsx
@@ -33,7 +33,7 @@ export const Relative = () => {
     screen.addEventListener('mouseup', handleMouseUp);
     screen.addEventListener('mousemove', handleMouseMove);
     screen.addEventListener('wheel', handleMouseWheel, { passive: false });
-    screen.addEventListener('contextmenu', (e) => e.preventDefault());
+    screen.addEventListener('contextmenu', disableEvent);
     document.addEventListener('pointerlockchange', handlePointerLockChange);
 
     // Mouse click event