[Closed] StandardPurchasingModule.Instance null ref exception

It keeps crashing on StandardPurchasingModule.Instance();

with error

System.NullReferenceException: Object reference not set to an instance of an object
at UnityEngine.Purchasing.StoreConfiguration.Deserialize (System.String json) [0x00000] in :0
at UnityEngine.Purchasing.StandardPurchasingModule.Instance (AndroidStore androidStore) [0x00000] in :0
at UnityEngine.Purchasing.StandardPurchasingModule.Instance () [0x00000] in :0
at Store.IngameStore.Awake () [0x00082] in D:\SomePath\Tools\IngameStore\IngameStore.cs:90
UnityEngine.Debug:LogError(Object)
Store.IngameStore:Awake() (at Assets/Plugins/Tools/IngameStore/IngameStore.cs:92)

Does anyone have any idea?

@ZZantal

Would you be able to provide the information requested here: