invalidoperationexception when app is in background and comes to foreground again.

[alirezapir]

in our app when game is in background for a while and we return to it, we get this error:

invalidoperationexception
System.Threading.Tasks.TaskCompletionSource`1[TResult].SetResult (TResult result) (at <cbd719cf9c4c450f93c8260479a647e2>:0)
Bazaar.Poolakey.Callbacks.ConnectionCallbackProxy.onDisconnect () (at G:/Unity Projects/NeuroLand/Assets/Bazaar/Poolakey/Scripts/Callbacks/ConnectionCallbackProxy.cs:21)
System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <cbd719cf9c4c450f93c8260479a647e2>:0)
Rethrow as TargetInvocationException: Bazaar.Poolakey.Callbacks.ConnectionCallbackProxy.onDisconnect()
UnityEngine.AndroidJavaProxy.Invoke (System.String methodName, System.Object[] args) (at /home/bokken/build/output/unity/unity/Modules/AndroidJNI/AndroidJava.cs:197)
UnityEngine.AndroidJavaProxy.Invoke (System.String methodName, UnityEngine.AndroidJavaObject[] javaArgs) (at /home/bokken/build/output/unity/unity/Modules/AndroidJNI/AndroidJava.cs:222)
UnityEngine.AndroidJavaProxy.Invoke (System.String methodName, System.IntPtr javaArgs) (at /home/bokken/build/output/unity/unity/Modules/AndroidJNI/AndroidJava.cs:248)
UnityEngine._AndroidJNIHelper.InvokeJavaProxyMethod (UnityEngine.AndroidJavaProxy proxy, System.IntPtr jmethodName, System.IntPtr jargs) (at /home/bokken/build/output/unity/unity/Modules/AndroidJNI/AndroidJava.cs:1231)

how to solve this?