Cannot read property 'getElementsByTagName' of null' error when trying to load a list.Issue When you click on 'Show related incidents' button on an incident form nothing happens and error shows Cannot read property 'getElementsByTagName' of null' CauseIf you check the response in network tab you will see some xml parsing error "XmlParseCharRef : Invalid Xml Char Value 55357"ResolutionThis could possibly happen if the list you are trying load contains fields such as comments and work notes that might contain a lot of comments, images, kb's etc so in order to resolve the issue just try to remove that field from the list view and issue should be resolved. Its not ideal to have those big fields on the list view and can cause some performance issues.