NullPointerException in BpmnParse#parseAssociations

if(sourceActivity.getProperty("type").equals("compensationBoundaryCatch")) {

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
             xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL http://www.omg.org/spec/BPMN/2.0/20100501/BPMN20.xsd"
             targetNamespace="foo">
   <process id="textAnnotation2" name="textAnnotation2">
      <startEvent id="start"/>
      <userTask id="firstTask" name="firstTask"/>
      <userTask id="secondTask" name="secondTask"/>
      <endEvent id="end"/>

      <sequenceFlow id="sequenceFlow95" sourceRef="start" targetRef="firstTask"/>
      <sequenceFlow id="sequenceFlow96" sourceRef="firstTask" targetRef="secondTask"/>
      <sequenceFlow id="sequenceFlow97" sourceRef="secondTask" targetRef="end"/>

      <association associationDirection="None" id="sid-BC23D2A5-6B2D-4A71-B570-CCE5501D70BD" sourceRef="firstTask" targetRef="textAnnotation"/>
      <association associationDirection="None" id="sid-CA66917D-33DF-4748-9F7E-5EF2E35DCA38" sourceRef="textAnnotation" targetRef="secondTask"/>
      <textAnnotation id="textAnnotation" textFormat="text/plain">
         <text>Doubly annotated</text>
      </textAnnotation>
   </process>
</definitions>

if(sourceActivity !=null && sourceActivity.getProperty("type").equals("compensationBoundaryCatch")) {
  Object isForCompensation = targetActivity.getProperty(PROPERTYNAME_IS_FOR_COMPENSATION);          
  if(isForCompensation == null || !(Boolean) isForCompensation) {
    addError("compensation boundary catch must be connected to element with isForCompensation=true", associationElement);
  } else {            
    ActivityImpl compensatedActivity = sourceActivity.getParentActivity();
    compensatedActivity.setProperty(PROPERTYNAME_COMPENSATION_HANDLER_ID, targetActivity.getId());            
  }
}