Alamofire: unexpectedly found nil while unwrapping an Optional value - ios

Question

Good Day.
I have a iOS Swift Application that communicates with a companies already created API and its communicated with using Alamofire. The problem I have is the API can possibly return nulls some time and this causes the following problem:
"fatal error: unexpectedly found nil while unwrapping an Optional value"
My code snippet that reads from the dictionary is as follows:
if let LowRate = HotelList[i]["LowRate"] as? Decimal!{
HList._LowRate = LowRate
}
I have reviewed multiple questions and google sites however I need a way to check the object in the dictionary for null before its processed or I need to set some type of default value.
The Json null example is as follows
HotelData = "<null>";
HotelList =(
{
Address1 = "124 Oceanview Road";
Address2 = Oneroa;
BookingUrl = "<null>";
City = " Auckland";
Country = "New Zealand";
CurrencyCode = "<null>";
DateViewed = "<null>";
Description = "<null>";
Directions = "<null>";
Distance = "<null>";
GeoPoint = "<null>";
HighRate = "<null>";
ImageUrl = "<null>";
LowRate = "<null>";
MinChildAge = "<null>";
Name = "The Oyster Inn";
NavUrl = "<null>";
PostalCode = "<null>";
State = "<null>";
WebsiteUrl = "<null>";
distance = "<null>";
hotelID = 130;
isActive = 1;
isBlocked = 0;
isChildrenAllowed = "<null>";
isFavorite = 0;
isPromoNotified = 0;
showDouble = "<null>";
}
);
RowCount = 11;
hasError = 0;
};
I am using Alamofire for my json and it works unless there is a null returned in one of the 20 fields that could possibly return a null.
Can anyone assist me in doing some validation checks for the result of a null as shown above while unwrapping an optional.
Regards

Answer 1

This is how you can do this.(Updated)
if let lowRate = json["LowRate"], !(lowRate is NSNull){
print(lowRate)
}else{
print("null")
}

Answer 2

Good Day
Thanks to all the contributions to helping me find my answer. What worked in the end was something very similar to above I had to use a NSNumber object and then cast it to a decimal later along the lines please see code below.
if let lowRate = HotelList[i]["LowRate"] as? NSNumber{
HList._LowRate = LowRate
}else{
print("Null")
}
Regards

Answer 3

Your json has array of only one object. What is the value of i? If it's greater than 0 it will crash.