FS-5216 seems like invalid codec lets try this

src/mod/languages/mod_spidermonkey/mod_spidermonkey.c

@@ -2008,7 +2008,9 @@ static JSBool session_speak(JSContext * cx, JSObject * obj, uintN argc, jsval *
 	args.buflen = len;
 
 	switch_core_speech_flush_tts(&jss->speech->sh);
-	switch_ivr_speak_text_handle(jss->session, &jss->speech->sh, &jss->speech->codec, NULL, text, &args);
+	if (switch_core_codec_ready(&jss->speech->codec)) {
+		switch_ivr_speak_text_handle(jss->session, &jss->speech->sh, &jss->speech->codec, NULL, text, &args);
+	}
 	JS_ResumeRequest(cx, cb_state.saveDepth);
 	check_hangup_hook(jss, &ret);
 	*rval = cb_state.ret;

src/switch_ivr_play_say.c

@@ -2141,6 +2141,10 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_speak_text_handle(switch_core_session
 		return SWITCH_STATUS_FALSE;
 	}
 
+	if (!switch_core_codec_ready(codec)) {
+		return SWITCH_STATUS_FALSE;
+	}
+
 	arg_recursion_check_start(args);
 
 	write_frame.data = abuf;