Fixing bug first add cannot be swiped.

js-src/carousel-ad.ts

@@ -146,14 +146,16 @@ export default class CarouselAd {
                 if (aPrev !== null) {
                     aPrev.classList.remove('show')
                     aPrev.classList.add('remove')
+                }
                 window.setTimeout(() => {
+                    if (aPrev !== null) {
                         aPrev.remove()
+                    }
                     for (const a of allAnchors) {
                         a.remove()
                     }
                     this.isLockedSwipe = false
                 }, 1000)
-                }
             }, 200)
             this.timeoutNumber = window.setTimeout(() => {
                 this.loadOneAd()