Improved error handling.

app/assets/javascripts/app/lib/base/jquery.contenteditable.js

@@ -104,13 +104,15 @@
 
         // break <blockquote> after enter on empty line
         sel = window.getSelection()
+        if (sel) {
           node = $(sel.anchorNode)
-        if (node.parent().is('blockquote')) {
+          if (node && node.parent() && node.parent().is('blockquote')) {
             e.preventDefault()
             document.execCommand('Insertparagraph')
             document.execCommand('Outdent')
             return
           }
+        }
 
         // behavior to enter new line on alt+enter
         //  on alt + enter not realy newline is fired, to make
@@ -246,7 +248,7 @@
 
       // limit check
       if ( !_this.allowKey(e) ) {
-        if ( !_this.maxLengthOk( 1 ) ) {
+        if ( !_this.maxLengthOk(1) ) {
           e.preventDefault()
           return
         }