diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3389ff61183d2de2836bf3035c09d88299d09c76..12dcd56b5c6360ebf3b79713d14fa57e453704b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+Bugfix Version 4.0.8
+====================
+
+* Remove outdated Readme
+* Validate empty/deleted timestamp values as true
+
 Bugfix Version 4.0.7
 ====================
 
diff --git a/edit/README.md b/edit/README.md
deleted file mode 100644
index 4d502ff6fc2c28ab7e2c4706b004ddde3cf98a7d..0000000000000000000000000000000000000000
--- a/edit/README.md
+++ /dev/null
@@ -1,16 +0,0 @@
-==========================
-DARIAH-DE Datasheet Editor
-==========================
-
-
-An input tool for the DARIAH-DE Geo-Browser.
-
-Needs bower ( see http://bower.io/ ) to resolve missing css & js-libs.
-
-$ sudo npm install -g bower
-
-worked for me... then do a
-
-$ bower install
-
-and it should be fine.
diff --git a/edit/js/dariah.workflow.table.js b/edit/js/dariah.workflow.table.js
index 352f2e7c92a104810731358299e05038dff61219..8212159a4e30d89a540eacfbbe5d9a72ca4a0b93 100644
--- a/edit/js/dariah.workflow.table.js
+++ b/edit/js/dariah.workflow.table.js
@@ -51,7 +51,7 @@ function handleHeaderCells(row) {
 function getDateFieldProps(){
 	return {
 		validator: function(value, callback){ //custom date validator
-			if (xsdGYear.test(value) || xsdGYearMonth.test(value) || xsdDateOrDateTime.test(value)) {
+			if (!value || xsdGYear.test(value) || xsdGYearMonth.test(value) || xsdDateOrDateTime.test(value)) {
 				callback(true);
 			} else callback(false);
 		},
diff --git a/package-lock.json b/package-lock.json
index 87e48d994b920e7296203a144d4b6c64aea9dc13..8fdd1fd4d8c4ddf9dd0e5b7ffe0ba98e36feecb7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "dariahde-datasheet-editor",
-  "version": "4.0.7",
+  "version": "4.0.8",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "dariahde-datasheet-editor",
-      "version": "4.0.7",
+      "version": "4.0.8",
       "dependencies": {
         "clipboard": "^2.0.8",
         "handsontable": "^9.0.2",
diff --git a/package.json b/package.json
index d3fc0b3be60b0b79917749c6ff192a9833189e37..4edfbe12626a30ac309da933ae04786a37865b10 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "dariahde-datasheet-editor",
-  "version": "4.0.7",
+  "version": "4.0.8",
   "private": true,
   "scripts": {
     "build:beta": "webpack --config webpack.config.dev.js",