fix get initial volume state

src/services/Player.js

@@ -31,7 +31,7 @@ export class Player {
 	doPlay(src) {
 
 		if (audioPlayer !== null) {
-			audioPlayer.fade(store.state.player.volume, 0, 500)
+			audioPlayer.fade(store.getters.getVolume, 0, 500)
 			Howler.unload()
 		} else {
 			this.updateSeek()
@@ -40,7 +40,7 @@ export class Player {
 		audioPlayer = new Howl({
 			src,
 			html5: true,
-			volume: store.state.player.volume,
+			volume: store.getters.getVolume,
 			onplay() {
 				const duration = audioPlayer.duration()
 				store.dispatch('setPlaying', true)
@@ -60,7 +60,7 @@ export class Player {
 		})
 		audioPlayer.unload()
 		audioPlayer.play()
-		audioPlayer.fade(0, store.state.player.volume, 500)
+		audioPlayer.fade(0, store.getters.getVolume, 500)
 
 	}
 

src/store/player.js

@@ -51,10 +51,10 @@ export default {
 			return state.duration
 		},
 		getVolume: state => {
-			if (isNaN(state.volume)) {
-				return 0.5
-			} else {
+			if (state.volume) {
 				return state.volume
+			} else {
+				return 0.5
 			}
 		},
 		isPlaying: state => {