fixup

src/IndexedDBEngine.js

@@ -75,7 +75,8 @@ export class IndexedDBEngine {
     })
   }
 
-  close () {
-    return closeDatabase(DB_NAME)
+  async close () {
+    await closeDatabase(DB_NAME)
+    this._db = null
   }
 }

src/database.js

@@ -50,6 +50,9 @@ export async function getEmojiByUnicode (unicode) {
 }
 
 export async function closeDatabase () {
-  await init()
-  return idbEngine.close()
+  if (idbEngine) {
+    await idbEngine.readyPromise
+    await idbEngine.close()
+    idbEngine = undefined
+  }
 }