TypeError: String.isString is not a function

View details in Rollbar: [https://rollbar.com/guiconti/reporter/items/3/](https://rollbar.com/guiconti/reporter/items/3/)

```

TypeError: String.isString is not a function
File "/Users/guiconti/GitHub/reporter/server/utils/validator.js", line 15, in Object.exports.isValidString.stringToValidate [as isValidString]
return String.isString(stringToValidate) && stringToValidate.trim().length > 0;
File "/Users/guiconti/GitHub/reporter/server/controllers/sendError.js", line 31, in module.exports
if (!validator.isValidString(data.item.title))
File "/Users/guiconti/GitHub/reporter/node_modules/express/lib/router/layer.js", line 95, in Layer.handle [as handle_request]
fn(req, res, next);
File "/Users/guiconti/GitHub/reporter/node_modules/express/lib/router/route.js", line 137, in next
layer.handle_request(req, res, next);
File "/Users/guiconti/GitHub/reporter/node_modules/express/lib/router/route.js", line 112, in Route.dispatch
next();
File "/Users/guiconti/GitHub/reporter/node_modules/express/lib/router/layer.js", line 95, in Layer.handle [as handle_request]
fn(req, res, next);
File "/Users/guiconti/GitHub/reporter/node_modules/express/lib/router/index.js", line 281, in
return layer.handle_request(req, res, next);
File "/Users/guiconti/GitHub/reporter/node_modules/express/lib/router/index.js", line 354, in param
return done();
File "/Users/guiconti/GitHub/reporter/node_modules/express/lib/router/index.js", line 365, in param
return param();
File "/Users/guiconti/GitHub/reporter/node_modules/express/lib/router/index.js", line 410, in Function.process_params
param();
```

Start in server/utils/validator.js at the reported isValidString implementation, then inspect server/controllers/sendError.js to understand how it validates data.item.title. Run the existing project checks or reproduce the send-error request, and consider the issue done when string validation no longer raises this TypeError and invalid titles are handled correctly.

Written by the indexing model from the issue text.