From e8d9fcf220debcfcf970b6a3829ad319d331cf3f Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sun, 18 Apr 2021 04:57:55 +0900
Subject: [PATCH] internal/uidriver/js: Bug fix: CursorPosition crashed before
 the main loop on browsers

Closes #1559
---
 internal/uidriver/js/input.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/internal/uidriver/js/input.go b/internal/uidriver/js/input.go
index af91a29b6..e4e25d696 100644
--- a/internal/uidriver/js/input.go
+++ b/internal/uidriver/js/input.go
@@ -54,6 +54,9 @@ type Input struct {
 }
 
 func (i *Input) CursorPosition() (x, y int) {
+	if i.ui.context == nil {
+		return 0, 0
+	}
 	xf, yf := i.ui.context.AdjustPosition(float64(i.cursorX), float64(i.cursorY))
 	return int(xf), int(yf)
 }