Errors running Relationship mapping

[stuart14]

This seeems to fail around 50% with these errors

Error executing cypher query: {code: Neo.ClientError.Procedure.ProcedureCallFailed} {message: Failed to invoke procedure apoc.do.case: Caused by: java.lang.NullPointerException: Cannot invoke "java.lang.Boolean.booleanValue()" because the return value of "java.util.Iterator.next()" is null}

neo4j.exceptions.ClientError: {code: Neo.ClientError.Procedure.ProcedureCallFailed} {message: Failed to invoke procedure apoc.merge.relationship: Caused by: org.neo4j.exceptions.SyntaxException: Invalid input 'IMPERSONATE': expected "%", "(" or an identifier (line 1, column 72 (offset: 71))
"WITH $startNode as startNode, $endNode as endNode MERGE (startNode)-[r:IMPERSONATE{}]->(endNode) ON CREATE SET r+= $onCreateProps ON MATCH SET r+= $onMatchProps RETURN r"