**BUG** Concise problem statement: Steps to reproduce bug: 1. 2. 3. Results: Expected results: Url:<you url here>(click the Share my works button to get it) Browser:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36 errMsg:#browser: chrome; #type: undefined; #string: SyntaxError: Failed to execute 'querySelectorAll' on 'Element': '#' is not a valid selector.; #stack: Error: Failed to execute 'querySelectorAll' on 'Element': '#' is not a valid selector. at Object.History.$o0101 (https://easyeda.com/lib/min/editorSCH.min.js:7:11391) at Object.History.$o0100 (https://easyeda.com/lib/min/editorSCH.min.js:7:17715) at Object.History.$o099 (https://easyeda.com/lib/min/editorSCH.min.js:4:29677) at Object.History.go (https://easyeda.com/lib/min/editorSCH.min.js:6:4644) at callCommand.registerHook.undo (https://easyeda.com/lib/min/editorSCH.min.js:5:30676) at callCommand (https://easyeda.com/lib/min/editorSCH.min.js:1:116) at HTMLDocument.handleKeydown (https://easyeda.com/lib/min/editorSCH.min.js:2:14516)