diff --git a/internal/uidriver/glfw/ui.go b/internal/uidriver/glfw/ui.go
index 7140b8bf0..82144eeeb 100644
--- a/internal/uidriver/glfw/ui.go
+++ b/internal/uidriver/glfw/ui.go
@@ -1039,7 +1039,12 @@ func (u *UserInterface) setWindowSize(width, height int, fullscreen bool) {
 			if oldW != newW || oldH != newH {
 				ch := make(chan struct{}, 1)
 				u.window.SetFramebufferSizeCallback(func(_ *glfw.Window, _, _ int) {
-					ch <- struct{}{}
+					// This callback can be invoked multiple times by one PollEvents in theory (#1618).
+					// Allow the case when the channel is full.
+					select {
+					case ch <- struct{}{}:
+					default:
+					}
 				})
 				u.window.SetSize(newW, newH)
 				// Just after SetSize, GetSize is not reliable especially on Linux/UNIX.