[SOLVED] How to prevent Wifi from sending "garbage" to Serial2?

I'm using Serial2.TX for a specific purpose and without RX pin, it satisfies my needs. As of now, I can use Serial2 by sending my data naber (means hello) as normal.

With a fixed interval, Wifi module sends some garbage to Serial2, so what I could capture is as follows:

ernabernabernabernabernabernabernabernab­er849614> Wifi event: probe request from station 74:f0:6d:09:91:54, rssi = -58
849644> Wifi event: probe request from station 74:f0:6d:09:91:54, rssi = -61
nabernabernabernaber850186> Wifi event: probe request from station 00:26:ab:e8:43:82, rssi = -61
850188> Wifi event: probe request from station 00:26:ab:e8:43:82, rssi = -62
850256> Wifi event: probe request from station 00:26:ab:e8:43:82, rssi = -62
850298> Wifi event: probe request from station 00:26:ab:e8:43:82, rssi = -62

How can I make these logs stopped?