ParaView 5.6.1: crash when loading certain .pvtp file
wyan first reported this issue in Paraview crashes when saving pngs from pvtp files. The stack trace from the crash is:
0 libvtkCommonCore-pv5.6.1.dylib 0x0000000109d7af10 vtkSubjectHelper::InvokeEvent(unsigned long, void*, vtkObject*) + 832
1 libvtkCommonExecutionModel-pv5.6.1.dylib 0x00000001095c1e7d vtkAlgorithm::UpdateProgress(double) + 61
2 libvtkIOXML-pv5.6.1.dylib 0x00000001087b51e0 vtkXMLDataReader::DataProgressCallback() + 80
3 libvtkCommonCore-pv5.6.1.dylib 0x0000000109b8af21 vtkCallbackCommand::Execute(vtkObject*, unsigned long, void*) + 33
4 libvtkCommonCore-pv5.6.1.dylib 0x0000000109d7afc5 vtkSubjectHelper::InvokeEvent(unsigned long, void*, vtkObject*) + 1013
5 libvtkIOXMLParser-pv5.6.1.dylib 0x0000000108877b7d vtkXMLDataParser::ReadUncompressedData(unsigned char*, unsigned long long, unsigned long, unsigned long) + 941
6 libvtkIOXMLParser-pv5.6.1.dylib 0x000000010887812f vtkXMLDataParser::ReadBinaryData(void*, unsigned long long, unsigned long, int) + 175
7 libvtkIOXML-pv5.6.1.dylib 0x00000001087d2bfc vtkXMLReader::ReadArrayValues(vtkXMLDataElement*, long long, vtkAbstractArray*, long long, long long, vtkXMLReader::FieldType) + 1708
8 libvtkIOXML-pv5.6.1.dylib 0x00000001087ed044 vtkXMLUnstructuredDataReader::ReadArrayForPoints(vtkXMLDataElement*, vtkAbstractArray*) + 68
9 libvtkIOXML-pv5.6.1.dylib 0x00000001087b3bf4 vtkXMLDataReader::ReadPieceData() + 404
10 libvtkIOXML-pv5.6.1.dylib 0x00000001087ea49c vtkXMLUnstructuredDataReader::ReadPieceData() + 236
11 libvtkIOXML-pv5.6.1.dylib 0x00000001087c4bc5 vtkXMLPolyDataReader::ReadPieceData() + 325
12 libvtkIOXML-pv5.6.1.dylib 0x00000001087e9c78 vtkXMLUnstructuredDataReader::ReadXMLData() + 680
13 libvtkIOXML-pv5.6.1.dylib 0x00000001087d249b vtkXMLReader::RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 859
14 libvtkIOXML-pv5.6.1.dylib 0x00000001087d7375 vtkXMLReader::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 165
15 libvtkCommonExecutionModel-pv5.6.1.dylib 0x00000001095d4d45 vtkExecutive::CallAlgorithm(vtkInformation*, int, vtkInformationVector**, vtkInformationVector*) + 69
16 libvtkCommonExecutionModel-pv5.6.1.dylib 0x00000001095cf60d vtkDemandDrivenPipeline::ExecuteData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 61
17 libvtkCommonExecutionModel-pv5.6.1.dylib 0x00000001095ca0b8 vtkCompositeDataPipeline::ExecuteData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 104
18 libvtkCommonExecutionModel-pv5.6.1.dylib 0x00000001095ced8c vtkDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 1196
19 libvtkCommonExecutionModel-pv5.6.1.dylib 0x00000001095fd405 vtkStreamingDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 757
20 libvtkCommonExecutionModel-pv5.6.1.dylib 0x00000001095fd85e vtkStreamingDemandDrivenPipeline::Update(int, vtkInformationVector*) + 254
21 libvtkCommonExecutionModel-pv5.6.1.dylib 0x00000001095c5e29 vtkAlgorithm::Update(vtkInformation*) + 57
22 libvtkCommonExecutionModel-pv5.6.1.dylib 0x00000001095c5f11 vtkAlgorithm::UpdatePiece(int, int, int, int const*) + 145
23 libvtkIOXML-pv5.6.1.dylib 0x00000001087ccaf3 vtkXMLPUnstructuredDataReader::ReadPieceData() + 67
24 libvtkIOXML-pv5.6.1.dylib 0x00000001087c7746 vtkXMLPPolyDataReader::ReadPieceData() + 22
25 libvtkIOXML-pv5.6.1.dylib 0x00000001087cca67 vtkXMLPUnstructuredDataReader::ReadXMLData() + 807
26 libvtkIOXML-pv5.6.1.dylib 0x00000001087d249b vtkXMLReader::RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 859
27 libvtkIOXML-pv5.6.1.dylib 0x00000001087d7375 vtkXMLReader::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 165
28 libvtkPVVTKExtensionsCore-pv5.6.1.dylib 0x000000010662a13f vtkFileSeriesReader::RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 127
29 libvtkPVVTKExtensionsCore-pv5.6.1.dylib 0x0000000106629a9f vtkFileSeriesReader::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 543
30 libvtkCommonExecutionModel-pv5.6.1.dylib 0x00000001095d4d45 vtkExecutive::CallAlgorithm(vtkInformation*, int, vtkInformationVector**, vtkInformationVector*) + 69