diff --git a/rdf2graphml/src/main/java/uk/ac/rothamsted/kg/rdf2pg/graphml/export/support/GraphMLRelationExportHandler.java b/rdf2graphml/src/main/java/uk/ac/rothamsted/kg/rdf2pg/graphml/export/support/GraphMLRelationExportHandler.java
index f9a9fec..54a8560 100644
--- a/rdf2graphml/src/main/java/uk/ac/rothamsted/kg/rdf2pg/graphml/export/support/GraphMLRelationExportHandler.java
+++ b/rdf2graphml/src/main/java/uk/ac/rothamsted/kg/rdf2pg/graphml/export/support/GraphMLRelationExportHandler.java
@@ -72,10 +72,13 @@ public void accept ( Set<QuerySolution> relRecords )
   .map ( Integer::valueOf )
   .orElse ( -1 );
 
-if ( ondexIds.contains ( relOndexId ) )
-	log.warn ( "==== DUPED ID {} IN PROCESSOR", relOndexId );
-else
-	ondexIds.add ( relOndexId );
+if ( relOndexId != -1 )
+{
+	if ( ondexIds.contains ( relOndexId ) )
+		log.warn ( "==== DUPED ID {} IN HANDLER", relOndexId );
+	else
+		ondexIds.add ( relOndexId );
+}					
 			
 			String type = pgRelation.getType ();
 
diff --git a/rdf2graphml/src/main/java/uk/ac/rothamsted/kg/rdf2pg/graphml/export/support/GraphMLRelationExportProcessor.java b/rdf2graphml/src/main/java/uk/ac/rothamsted/kg/rdf2pg/graphml/export/support/GraphMLRelationExportProcessor.java
index b7e2cb7..e3b6a77 100644
--- a/rdf2graphml/src/main/java/uk/ac/rothamsted/kg/rdf2pg/graphml/export/support/GraphMLRelationExportProcessor.java
+++ b/rdf2graphml/src/main/java/uk/ac/rothamsted/kg/rdf2pg/graphml/export/support/GraphMLRelationExportProcessor.java
@@ -60,11 +60,13 @@ public void process ( RdfDataManager rdfMgr, Object...opts )
 	.map ( Literal::getInt )
 	.orElse ( -1 );
 
-if ( ondexIds.contains ( relOndexId ) )
-	log.warn ( "==== DUPED ID {} IN HANDLER", relOndexId );
-else
-	ondexIds.add ( relOndexId );
-					
+if ( relOndexId != -1 )
+{
+	if ( ondexIds.contains ( relOndexId ) )
+		log.warn ( "==== DUPED ID {} IN PROCESSOR", relOndexId );
+	else
+		ondexIds.add ( relOndexId );
+}					
 					solProc.accept ( qsol );
 				} 
 		);