diff --git a/src/hooks/useTxt2Voice.ts b/src/hooks/useTxt2Voice.ts
index 7bf984f..a6885b4 100644
--- a/src/hooks/useTxt2Voice.ts
+++ b/src/hooks/useTxt2Voice.ts
@@ -10,7 +10,7 @@ const useTxt2Voice = () => {
         utterance.pitch = 1;
         utterance.text = text;
         //@ts-ignore
-        synthesizer.speak(utterance);
+        synthesizer && synthesizer.speak(utterance);
     }
     const stop = () => {
         //@ts-ignore