exchange_rate: fix #5495
exchange_rate: fix #5495

pooler/electrum-ltc,vialectrum/vialectrum,spesmilo/electrum,wakiyamap/electrum-mona,wakiyamap/electrum-mona,neocogent/electrum,vialectrum/vialectrum,vialectrum/vialectrum,neocogent/electrum,wakiyamap/electrum-mona,spesmilo/electrum,pooler/electrum-ltc,pooler/electrum-ltc,wakiyamap/electrum-mona,spesmilo/electrum,spesmilo/electrum,neocogent/electrum,pooler/electrum-ltc