diff --git a/packages/core/src/widgets/datetime/DateTimeControl.tsx b/packages/core/src/widgets/datetime/DateTimeControl.tsx
index f647874c..7fdb8a04 100644
--- a/packages/core/src/widgets/datetime/DateTimeControl.tsx
+++ b/packages/core/src/widgets/datetime/DateTimeControl.tsx
@@ -158,10 +158,6 @@ const DateTimeControl: FC<WidgetControlProps<string, DateTimeField>> = ({
   );
 
   const dateTimePicker = useMemo(() => {
-    if (!internalValue) {
-      return null;
-    }
-
     const inputDate = field.picker_utc ? utcDate : dateValue;
 
     if (dateFormat && !timeFormat) {
@@ -258,7 +254,6 @@ const DateTimeControl: FC<WidgetControlProps<string, DateTimeField>> = ({
     handleChange,
     hasErrors,
     inputFormat,
-    internalValue,
     isDisabled,
     label,
     t,
diff --git a/packages/core/webpack.config.js b/packages/core/webpack.config.js
index 0346eace..7e6ebda5 100644
--- a/packages/core/webpack.config.js
+++ b/packages/core/webpack.config.js
@@ -29,6 +29,7 @@ module.exports = {
         exclude: [
           /(node_modules[\\/]@toast-ui[\\/]editor[\\/]dist)/,
           /(node_modules[\\/]nth-check[\\/]lib)/,
+          /(node_modules[\\/]minimatch[\\/]dist)/,
           /(src[\\/]formats[\\/]util)/,
         ],
       },
diff --git a/packages/demo/node_modules/.bin/webpack b/packages/demo/node_modules/.bin/webpack
deleted file mode 100644
index f95aa812..00000000
--- a/packages/demo/node_modules/.bin/webpack
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/bin/sh
-basedir=$(dirname "$(echo "$0" | sed -e 's,\\,/,g')")
-
-case `uname` in
-    *CYGWIN*) basedir=`cygpath -w "$basedir"`;;
-esac
-
-if [ -x "$basedir/node" ]; then
-  "$basedir/node"  "$basedir/../../../../node_modules/webpack/bin/webpack.js" "$@"
-  ret=$?
-else 
-  node  "$basedir/../../../../node_modules/webpack/bin/webpack.js" "$@"
-  ret=$?
-fi
-exit $ret
diff --git a/packages/demo/node_modules/.bin/webpack b/packages/demo/node_modules/.bin/webpack
new file mode 120000
index 00000000..7ec0527a
--- /dev/null
+++ b/packages/demo/node_modules/.bin/webpack
@@ -0,0 +1 @@
+../../../../node_modules/webpack/bin/webpack.js
\ No newline at end of file
diff --git a/packages/demo/node_modules/.bin/webpack.cmd b/packages/demo/node_modules/.bin/webpack.cmd
deleted file mode 100644
index cead0686..00000000
--- a/packages/demo/node_modules/.bin/webpack.cmd
+++ /dev/null
@@ -1,7 +0,0 @@
-@IF EXIST "%~dp0\node.exe" (
-  "%~dp0\node.exe"  "%~dp0\..\..\..\..\node_modules\webpack\bin\webpack.js" %*
-) ELSE (
-  @SETLOCAL
-  @SET PATHEXT=%PATHEXT:;.JS;=;%
-  node  "%~dp0\..\..\..\..\node_modules\webpack\bin\webpack.js" %*
-)
\ No newline at end of file