From ec86db4bfbb1f7e165d0620cb4d85c2b9beb36bc Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Tue, 12 Mar 2019 01:05:50 +0100
Subject: [PATCH] when saving parameters make sure document exists

---
 src/Base/Parameter.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/Base/Parameter.cpp b/src/Base/Parameter.cpp
index d6a392b550..57d1387c7a 100644
--- a/src/Base/Parameter.cpp
+++ b/src/Base/Parameter.cpp
@@ -1353,10 +1353,12 @@ void  ParameterManager::SaveDocument(XMLFormatTarget* pFormatTarget) const
         //
         // do the serialization through DOMWriter::writeNode();
         //
-        DOMLSOutput *theOutput = ((DOMImplementationLS*)impl)->createLSOutput();
-        theOutput->setEncoding(gOutputEncoding);
-        theOutput->setByteStream(pFormatTarget);
-        theSerializer->write(_pDocument, theOutput);
+        if (_pDocument) {
+            DOMLSOutput *theOutput = ((DOMImplementationLS*)impl)->createLSOutput();
+            theOutput->setEncoding(gOutputEncoding);
+            theOutput->setByteStream(pFormatTarget);
+            theSerializer->write(_pDocument, theOutput);
+        }
 
         delete theSerializer;
     }