diff -r aaadcca77f1f writerfilter/source/dmapper/DomainMapper_Impl.cxx
--- a/writerfilter/source/dmapper/DomainMapper_Impl.cxx	Sun Dec 20 20:17:35 2009 +0100
+++ b/writerfilter/source/dmapper/DomainMapper_Impl.cxx	Mon Jan 04 07:46:08 2010 +0100
@@ -2562,6 +2562,12 @@
   -----------------------------------------------------------------------*/
 void DomainMapper_Impl::AppendFieldCommand(::rtl::OUString& rPartOfCommand)
 {
+    OSL_ENSURE(!m_aFieldStack.empty(), "no field to append to");
+    if (m_aFieldStack.empty())
+    {
+        return;
+    }
+
     FieldContextPtr pContext = m_aFieldStack.top();
     OSL_ENSURE( pContext.get(), "no field context available");
     if( pContext.get() )
@@ -2578,6 +2584,12 @@
   -----------------------------------------------------------------------*/
 void DomainMapper_Impl::CloseFieldCommand()
 {
+    OSL_ENSURE(!m_aFieldStack.empty(), "no field to close");
+    if (m_aFieldStack.empty())
+    {
+        return;
+    }
+
     FieldContextPtr pContext = m_aFieldStack.top();
     OSL_ENSURE( pContext.get(), "no field context available");
     if( pContext.get() )
@@ -3302,11 +3314,14 @@
 {
     bool bRet = false;
     OSL_ENSURE( !m_aFieldStack.empty(), "field stack empty?");
-    FieldContextPtr pContext = m_aFieldStack.top();
-    OSL_ENSURE( pContext.get(), "no field context available");
-    if( pContext.get() )
+    if (!m_aFieldStack.empty())
     {
-        bRet = pContext->GetTextField().is();
+        FieldContextPtr pContext = m_aFieldStack.top();
+        OSL_ENSURE( pContext.get(), "no field context available");
+        if( pContext.get() )
+        {
+            bRet = pContext->GetTextField().is();
+        }
     }
     return bRet;
 }
@@ -3315,6 +3330,12 @@
   -----------------------------------------------------------------------*/
 void DomainMapper_Impl::SetFieldResult( ::rtl::OUString& rResult )
 {
+    OSL_ENSURE(!m_aFieldStack.empty(), "no field to set result to");
+    if (m_aFieldStack.empty())
+    {
+        return;
+    }
+
     FieldContextPtr pContext = m_aFieldStack.top();
     OSL_ENSURE( pContext.get(), "no field context available");
     if( pContext.get() )
@@ -3365,6 +3386,12 @@
   -----------------------------------------------------------------------*/
 void DomainMapper_Impl::PopFieldContext()
 {
+    OSL_ENSURE(!m_aFieldStack.empty(), "no field to pop");
+    if (m_aFieldStack.empty())
+    {
+        return;
+    }
+
     FieldContextPtr pContext = m_aFieldStack.top();
     OSL_ENSURE( pContext.get(), "no field context available");
     if( pContext.get() )