[backport] PR #7257 to 4.x

src/ui/public/stringify/__tests__/_ip.js

@@ -1,16 +1,21 @@
 describe('IP Address Format', function () {
-  let fieldFormats;
   let expect = require('expect.js');
   let ngMock = require('ngMock');
 
+  let ip;
   beforeEach(ngMock.module('kibana'));
   beforeEach(ngMock.inject(function (Private) {
-    fieldFormats = Private(require('ui/registry/field_formats'));
+    const fieldFormats = Private(require('ui/registry/field_formats'));
+    ip = fieldFormats.getInstance('ip');
   }));
 
   it('convers a value from a decimal to a string', function () {
-    let ip = fieldFormats.getInstance('ip');
     expect(ip.convert(1186489492)).to.be('70.184.100.148');
   });
 
+  it('converts null and undefined to -',  function () {
+    expect(ip.convert(null)).to.be('-');
+    expect(ip.convert(undefined)).to.be('-');
+  });
+
 });

src/ui/public/stringify/types/Ip.js

@@ -13,6 +13,7 @@ define(function (require) {
     Ip.fieldType = 'ip';
 
     Ip.prototype._convert = function (val) {
+      if (val === undefined || val === null) return '-';
       if (!isFinite(val)) return val;
 
       // shazzam!