Shutter not clickable on certain block of code

[KamKaminski]

Shutter is not clickable for whatever reason on this bit of code, replicated the issue on different system.
void setupWiFi()
{
#ifdef SOFTAP_MODE
Serial.println("Configuring access point...");
uint8_t mac[6];
char buff[128];
WiFi.macAddress(mac);
sprintf(buff, "T-Higrow-%02X:%02X", mac[4], mac[5]);
WiFi.softAP(buff);
Serial.printf("SERIVE IS running at 192.168.4.1 %s \n", buff);

#else
WiFi.mode(WIFI_STA);

Serial.print("Connect SSID:");
Serial.print(WIFI_SSID);
Serial.print(" Password:");
Serial.println(WIFI_PASSWD);
Serial.println(millis());
WiFi.begin(WIFI_SSID2, WIFI_PASSWD2);
if (WiFi.waitForConnectResult() != WL_CONNECTED) {

    Serial.println("WiFi connect fail!");
    delay(3000);
    esp_restart();
}

Serial.print("WiFi connect success ! , ");
Serial.print("IP Address: ");
Serial.println(WiFi.localIP());

config.api_key = API_KEY;
config.database_url = DATABASE_URL;
if (Firebase.signUp(&config, &auth, "", ""))
{
    Serial.println("ok");
    signupOK = true;
}
    else
    {
        Serial.printf("%s\n", config.signer.signupError.message.c_str());
    }
Firebase.begin(&config, &auth);
Firebase.reconnectWiFi(true);

#endif
server.begin();
}

[pfui-bah-kiste]

Same problem as in #140 and #148.

[DaphneOdera17]

see #140 (comment) .
This line "sprintf(buff, "T-Higrow-%02X:%02X", mac[4], mac[5]);" cause the problem