Cant read property 'get' of undefined in nodejs - node.js

Question

I am using Neo4j for the first time with nodejs and developing an application. I am getting the following error. I tried my best. Can you please help me with this error?
Error
(node:16148) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'get' of
undefined
at E:\fyps\app.js:120:33
at processTicksAndRejections (internal/process/task_queues.js:93:5)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:16148) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error
originated either by throwing inside of an async function without a catch block, or by
rejecting a promise which was not handled with .catch(). To terminate the node process
on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see
https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:16148) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated.
In the future, promise rejections that are not handled will terminate the Node.js
process with
a non-zero exit code.
code
app.get('/person/:id',function(req,res){
var id = req.params.id;
session
.run("MATCH (a:Person) WHERE id(a)=$idParam RETURN a.name as name", {idParam: id})
.then(function(result){
var name =result.records[0].get("name");
session
.run("OPTIONAL MATCH (a:Person)- [r:BORN_in]-(b:location) where id(a)=$idParam RETURN b.city as city, b.state as state" , {idParam:id})
.then(function(result2){
var city =result2.records[0].get("city");
var state =result2.records[0].get("state");
session
.run("OPTIONAL MATCH (a:Person)-[r:FRIENDS]-(b:Person) WHERE id(a)=$idParam RETURN b", {idParam:id})
.then(function(result3){
var friendsArr =[];
result3.records.forEach(function(record){
if(record._fields[0] != null){
friendsArr.push({
id: record._fields[0].identity.low,
name: record._fields[0].properties.name
});
}
})
res.render('person',{
id:id,
name:name,
city:city,
state:state,
friends:friendsArr
})
session.close();
})
.catch(function(error){
console.log(error);
})
can you please help me that how to solve this error.. Thanks

Answer 1

The error message clearly says that you are calling the get function on some entity that is undefined, and that has happened within a Promise. So, the error statement can be any one of these:
var name =result.records[0].get("name");
var city =result2.records[0].get("city");
var state =result2.records[0].get("state");
Add some relevant log statements to check which one is causing the issue.