Prevent xmlns=" " added to copy element using xslt

I have a XML file where i want to copy some element using XSLT, But it's adding xmlns=" " in copied element.

XSLT

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" 
  xmlns:xsl="http://ift.tt/tCZ8VR"  xmlns:x="http://ift.tt/1kQOu7M" 
exclude-result-prefixes="x">
 <xsl:output method="xml" indent="yes"/>
<!-- Identity transform -->
<xsl:template match="@* | node()">
    <xsl:copy>
     <xsl:apply-templates select="@* | node()"/>
  </xsl:copy>
</xsl:template>

<xsl:template match="x:Adapter[@Key='AuditLogging']">
   <xsl:copy-of select="."/>
    <Adapter Key="AutoExport">
    </Adapter>
 </xsl:template>

XML

 <Adapters xmlns="http://ift.tt/1kQOu7M">
   <Adapter Key="LASTCHANGEDATE" />
   <Adapter Key="AuditLogging" />
 </Adapters>

Output XML

<Adapters xmlns="http://ift.tt/1kQOu7M">
   <Adapter Key="LASTCHANGEDATE" />
   <Adapter Key="AuditLogging" />
    <Adapter Key="AutoExport" xmlns="" />
</Adapters>

How to prevent adding xmlns=" " in element.