ib.ticker not returning price

[TradingData684]

Hello everyone,

I am currently encountering the problem that ib.ticker sometimes returns a ticker with bid/as price, but sometimes not.
My Code looks like this:

ib.reqMktData(contract, snapshot=True)
ib.sleep(5)
opt_price_data = ib.ticker(contract)
ib.sleep(5)

print(opt_price_data.bid)

Iam trying to request the last price data for a simple Bull Put Spread. However, as I said sometimes the code returns a ticker with a price and sometimes without. Can somebody please tell me why?

Thanks :)