[Fix] only subscribe if contract data found

This commit is contained in:
vn.py 2019-09-19 16:07:32 +08:00
parent 5e8a648874
commit 2322406a93

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@ -221,6 +221,7 @@ class SpreadDataEngine:
# Subscribe market data # Subscribe market data
contract = self.main_engine.get_contract(vt_symbol) contract = self.main_engine.get_contract(vt_symbol)
if contract:
req = SubscribeRequest( req = SubscribeRequest(
contract.symbol, contract.symbol,
contract.exchange contract.exchange