IB-Exception-placing-trade-thread-safety-error

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6/11/2025 09:30:51:618
Interactive Brokers

Interactive Brokers Broker: Exception Placing Trade: Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.

InvalidOperationException

CODE:

   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at WealthLab.InteractiveBrokers.IBConnection.RequestContractDetails(Contract c)
   at WealthLab.InteractiveBrokers.IBConnection.GetSymbolInfo(String symbol)
   at WealthLab.InteractiveBrokers.IBConnection.RoundToMarketRule(Contract c, Transaction t, Double orderPrice, Double incr)
   at WealthLab.InteractiveBrokers.IBBroker.PlaceTradeInternal(Transaction t, String ocoGroup, Boolean replaceOrder)

Better late than never. :)
It happens about once every two weeks?

We'll have to try to identify that non-concurrent collection and make it concurrent!