fix panic
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@ -31,7 +31,7 @@ func (d *quicDialer) parseMetadata(md mdata.Metadata) (err error) {
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d.md.cipherKey = []byte(key)
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}
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if !md.IsExists(keepAlive) || mdutil.GetBool(md, keepAlive) {
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if md == nil || !md.IsExists(keepAlive) || mdutil.GetBool(md, keepAlive) {
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d.md.keepAlivePeriod = mdutil.GetDuration(md, keepAlivePeriod)
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if d.md.keepAlivePeriod <= 0 {
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d.md.keepAlivePeriod = 10 * time.Second
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