TypeError evaluating 'this.actions.length')?

Error {column: 974070, line: 5, message: "...

column: 974070

line: 5

message: "undefined is not an object (evaluating 'this.actions.length')"

sourceURL: "https://servicewechat.com/preload/page-frame.html"

stack: "_updatePosition@https://servicewechat.com/preload/page-frame.html:5:974070 https://servicewechat.com/preload/page-frame.html:5:623792"