1 files changed, 13 insertions, 1 deletions
diff --git a/ext/bg/js/mecab.js b/ext/bg/js/mecab.js
index fba9b2eb..4c62c2b0 100644
--- a/ext/bg/js/mecab.js
+++ b/ext/bg/js/mecab.js
@@ -19,16 +19,20 @@
 
 class Mecab {
     constructor() {
+        this.port = null;
         this.listeners = {};
         this.sequence = 0;
-        this.startListener();
     }
 
     async parseText(text) {
+        if (this.port === null) {
+            return {};
+        }
         return await this.invoke('parse_text', {text});
     }
 
     startListener() {
+        if (this.port !== null) { return; }
         this.port = chrome.runtime.connectNative('yomichan_mecab');
         this.port.onMessage.addListener((message) => {
             const {sequence, data} = message;
@@ -41,6 +45,14 @@ class Mecab {
         });
     }
 
+    stopListener() {
+        if (this.port === null) { return; }
+        this.port.disconnect();
+        this.port = null;
+        this.listeners = {};
+        this.sequence = 0;
+    }
+
     invoke(action, params) {
         return new Promise((resolve, reject) => {
             const sequence = this.sequence++;