Error when combining word files

Problem signature:

Problem Event Name: APPCRASH

Application Name: WINWORD.EXE

Application Version: 16.0.5005.1000

Application Timestamp: 5e966196

Fault Module Name: PDFPort.dll

Fault Module Version: 2.1.0.45964

Fault Module Timestamp: 5e7f9317

Exception Code: c000001d

Exception Offset: 000aa54e

OS Version: 6.1.7601.2.1.0.256.4

Locale ID: 1033



Additional information about the problem:

LCID: 1033

skulcid: 1033