DNS Server, DHCP Client and Server works fine, but request time out occurs when using MikroTik as an access point for a modem

DNS Server, DHCP Client and Server works fine, but request time out occurs
when using MikroTik as an access point for a modem

I use 2 Mikrotik wireless router, the first one is connected to modem and
it works perfectly (SSID: server-one (hidden)).
Second router ID:
ether1: 192.168.1.1
wlan1: dhcp-client
wlan2: 192.168.2.1
SSID: skywifi
Then, i tried to configure the second router. I set wlan1 to connect to
server-one, as a station and dhcp client and received 192.168.50.124 as
its IP, 192.168.50.254 as its gateway.
I set wlan2 as an ap-bridge, and set it as dhcp server. Then I create a
static route to 0.0.0.0/0 through 192.168.50.254.
Connection OK, DNS to device connecting skywifi works perfectly, i can
nslookup google.com. The problem is, when i tried to ping google.com, it
always give request time out reply. (Note that I also tried to ping
another host too (Wikipedia,Yahoo, etc). The result is also request time
out.
Any idea why this things happened? Thanks,