rails2 ruby geocoder issue when finding the distance - ruby

Question

I'm using ruby geocoder gem in my rails2 app. When a user tries to sign up i'm taking his ip and fetching lat and long using geocoder. Next, taking user entered address and fetching lat and longitude. Finally checking the distance between those two.If distance is greater than 100 am adding an error. This is happening in before_create callback(As per clients requirement). But the issue here is geocoder is sending continuous requests and breaking.Below is my code.
Given some dummy address and ip for testing purpose.
def validate_address_and_ip
p "validate_address_and_ip"
dup_addr = "Level 8, Umiya Business Bay Tower 1,Cessna Business Park, Maratahalli ORR,Sarjapur Ring Road, Kadubeesanahalli,Bangalore"
ip_based_lat_lng = Geocoder.search("183.82.98.134").map{ |obj| [obj.latitude, obj.longitude] }.flatten#ip_address
p "ip_based_lat_lng=", ip_based_lat_lng
addr_results = Geocoder.search(dup_addr)#address.full_address
addr_based_result = addr_results.first.geometry["location"]
lat,lang = addr_based_result["lat"], addr_based_result["lng"]
dist_in_miles = Geocoder::Calculations.distance_between(ip_based_lat_lng, [lat, lang]).round
puts "***************#{dist_in_miles}*******************************"
if 300 > 100
p "*****************in if condition**********************"
self.errors.add_to_base('zip code and IP mismatch.')
return false
puts "***************#{self.errors}*******************************"
end
end
Error: Numerical argument out of domain - sqrt
in log am getting
"validate_address_and_ip"
"ip_based_lat_lng="
[17.3753, 78.4744]
******311***************
"*******in if condition***********"
"validate_address_and_ip"
Geocoding API not responding fast enough (use Geocoder.configure(:timeout => ...) to set limit).
"ip_based_lat_lng="
[]
Why is that method getting called multiple times? Can anyone tell me the issue