Subscribed instruments missing in the ticks

Hi All,

I am trying to get the price of two symbols from the same tick using the following code(the instruments appear in the ticks in the order of subscription)-

inst_token = [13206274,13260546]
def on_connect(ws, response):
    ws.subscribe(inst_token)
    ws.set_mode(ws.MODE_FULL, inst_token)


def on_ticks(ws, ticks):
    if (ticks[0]['instrument_token'] == 13206274):
            symobl1_price = ticks[0]['last_price']           ##### get symbol1 tick price
            print(symobl1_price)
            symobl1_sell_price= ticks[0]['depth']['buy'][0]['price']
            symobl1_buy_price = ticks[0]['depth']['sell'][0]['price']
    if (ticks[1]['instrument_token'] == 13260546):
            symobl2_price = ticks[1]['last_price']            ##### get symbol2 tick price
            print(symobl2_price)
            symobl2_sell_price = ticks[1]['depth']['buy'][0]['price']
            symobl2_buy_price = ticks[1]['depth']['sell'][0]['price']

This code runs fine for a few ticks,but soon gives an error in this line-

symobl2_price = ticks[1]['last_price'] ,list index out of range.

Does this mean that the tick is showing the price of only one symbol?I have subscribed to two instruments in the on_connect function,why does this then give the data of only one symbol in the tick?

To counter this problem,I used the following approach--

 if len(ticks) == 2:
        if (ticks[0]['instrument_token'] == 13206274):
            symobl1_price = ticks[0]['last_price']           ##### get axis tick
            print(symobl1_price)
            symobl1_sell_price= ticks[0]['depth']['buy'][0]['price']
            symobl1_buy_price = ticks[0]['depth']['sell'][0]['price']
        if (ticks[1]['instrument_token'] == 13260546):
            symobl2_price = ticks[1]['last_price']            ##### get icici tick
            print(symobl2_price)
            symobl2_sell_price = ticks[1]['depth']['buy'][0]['price']
            symobl2_buy_price = ticks[1]['depth']['sell'][0]['price']

    else:
        print('Hi from else')

When i run this code,i can see that it goes into the else block frequently.

Any idea why this happens,and a better way achieve the same output.