From 2ab5a0bc2589e36b4e8b8dfcc93116c7bffaf51a Mon Sep 17 00:00:00 2001
From: Benjamin Paassen <bpaassen@techfak.uni-bielefeld.de>
Date: Fri, 10 Apr 2015 13:45:34 +0200
Subject: fixed nullpointer exceptions in XML output.

---
 src/plugins/xml/XmlOutput.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/plugins/xml/XmlOutput.cpp b/src/plugins/xml/XmlOutput.cpp
index 80b3af5..0d7b0dc 100644
--- a/src/plugins/xml/XmlOutput.cpp
+++ b/src/plugins/xml/XmlOutput.cpp
@@ -179,7 +179,9 @@ void XmlTransformer::writeXml(Handle<Document> doc, std::ostream &out,
 			}
 		}
 		Rooted<Element> ontology = transformOntology(document, o, P);
-		document->addChild(ontology);
+		if (ontology != nullptr) {
+			document->addChild(ontology);
+		}
 	}
 	// write imports for all referenced typesystems.
 	for (auto t : doc->getTypesystems()) {
@@ -198,7 +200,9 @@ void XmlTransformer::writeXml(Handle<Document> doc, std::ostream &out,
 			}
 		}
 		Rooted<Element> typesystem = transformTypesystem(document, t, P);
-		document->addChild(typesystem);
+		if (typesystem != nullptr) {
+			document->addChild(typesystem);
+		}
 	}
 
 	// transform the root element (and, using recursion, everything below it)
-- 
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