With bug 373382 and bug 375524 an import crash happens when enums are used before defined. Looking at the importer source this crash probably happens also with idl imports.
Git commit 66631c814e73727b99d87f9cd2a976fd0074814c by Ralf Habacker. Committed on 18/01/2017 at 22:09. Pushed by habacker into branch 'Applications/16.12'. Fix 'IDL import probably crashes when enums are used before defined'. FIXED-IN:2.12.2 (KDE Applications 16.12.2) M +4 -1 umbrello/codeimport/idlimport.cpp https://commits.kde.org/umbrello/66631c814e73727b99d87f9cd2a976fd0074814c