Uncaught SyntaxError

[Bobby20]

I have this Business Rule that keeps returning the follower error and I can't figure out what's wrong: 

"Uncaught error: SyntaxError: Unexpected token: u"

Here's the code:
(function executeRule(current, previous /*null when async*/) {

 // Add your code here
try { 
 var r = new sn_ws.RESTMessageV2('x_275105_iplookup.IPInfo', 'GetIPInfo');
 r.setStringParameterNoEscape('specific_field', 'geo');
 r.setStringParameterNoEscape('ip_address', 'current.address');
// Convert the json formatted string to a JavaScript Object
 var responseObj = JSON.parse(responseBody);
//Set the value of the City field on the IPAddressInfo record
 current.city = responseObj.city;
 gs.info("City = " + current.city);
 current.update();
//override authentication profile 
//authentication type ='basic'/ 'oauth2'
//r.setAuthentication(authentication type, profile name);

//set a MID server name if one wants to run the message on MID
//r.setMIDServer('MY_MID_SERVER');

//if the message is configured to communicate through ECC queue, either
//by setting a MID server or calling executeAsync, one needs to set skip_sensor
//to true. Otherwise, one may get an intermittent error that the response body is null
//r.setEccParameter('skip_sensor', true);

 var response = r.execute();
 var responseBody = response.getBody();
 var httpStatus = response.getStatusCode();
}
catch(err) {
 gs.info("Uncaught error: " + err);
}
})(current, previous);

[Bobby20]

That helped but now I get this error: "

Uncaught error: TypeError: Cannot read property "address" from null"

[ggg]

so current is null.

what table is the BR on? when does it run (before, after etc...)

[Harsh Vardhan]

put the log and validate are you getting some value in current.address 

gs.info('address value is'+current.address);

[Harsh Vardhan]

also share the screenshot of your rest message GetIPInfo method, did you pass the parameter in the end point url on the method ?

[Bobby20]

I add that and I'm getting the same error: 

Uncaught error: TypeError: Cannot read property "address" from null.