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Windows SetTooltip invalid memory address #158

@psidex

Description

@psidex
PS C:\Users\Simon\go\src\github.com\psidex\EACS> go run .\cmd\test\main.go
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x0 pc=0x6608e6]

goroutine 6 [running]:
github.com/getlantern/systray.(*winTray).setTooltip(0x921fa0, 0x6f6138, 0x1d, 0xc000086058, 0xc0000311b8)
        C:/Users/Simon/go/pkg/mod/github.com/getlantern/systray@v1.0.3/systray_windows.go:226 +0x66
github.com/getlantern/systray.SetTooltip(0x6f6138, 0x1d)
        C:/Users/Simon/go/pkg/mod/github.com/getlantern/systray@v1.0.3/systray_windows.go:852 +0x4c
main.OnReady()
        C:/Users/Simon/go/src/github.com/psidex/EACS/cmd/test/main.go:8 +0x3d
github.com/getlantern/systray.Register.func2(0xc000014180, 0x706528)
        C:/Users/Simon/go/pkg/mod/github.com/getlantern/systray@v1.0.3/systray.go:91 +0x45
created by github.com/getlantern/systray.Register
        C:/Users/Simon/go/pkg/mod/github.com/getlantern/systray@v1.0.3/systray.go:89 +0xe3
exit status 2

here is the contents of main.go:

package main

import (
	"github.com/getlantern/systray"
)

func OnReady() {
	systray.SetTooltip("This is the tooltip text")
}

func OnExit() {
	// No cleanup needed.
}

func main() {
	systray.Run(OnReady, OnExit)
}

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