[Interest] Assistant (4.8.6) terminating with uncaught exception of type CLuceneError

[René J.V. Bertin]

Hi,

All of a sudden my 4.8.6 Assistant (which I admit using quite often) aborts, "terminating with uncaught exception of type CLuceneError" (according to libc++abi.dylib).
Any idea what might cause this, and above all, how to restore normal operation?

The relevant backtrace suggests that I may have a corrupt search index or qch file, but how to confirm that?

Thread 10 Crashed:: fulltextsearch::clucene::QHelpSearchIndexWriter
0   libsystem_kernel.dylib        	0x00007fff869d4866 __pthread_kill + 10
1   libsystem_pthread.dylib       	0x00007fff87c5135c pthread_kill + 92
2   libsystem_c.dylib             	0x00007fff87b88b1a abort + 125
3   libc++abi.dylib               	0x00007fff8edddf31 abort_message + 257
4   libc++abi.dylib               	0x00007fff8ee03952 default_terminate_handler() + 264
5   libobjc.A.dylib               	0x00007fff869f2322 _objc_terminate() + 124
6   libc++abi.dylib               	0x00007fff8ee011d1 std::__terminate(void (*)()) + 8
7   libc++abi.dylib               	0x00007fff8ee00e7b __cxa_rethrow + 109
8   QtCLucene                     	0x000000010d28ee36 lucene::index::IndexReader::open(lucene::store::Directory*, bool) + 294 (IndexReader.cpp:100)
9   QtCLucene                     	0x000000010d28ecde lucene::index::IndexReader::open(QString const&) + 30 (IndexReader.cpp:73)
10  QtCLucene                     	0x000000010d2c595f lucene::search::IndexSearcher::IndexSearcher(QString const&) + 79 (IndexSearcher.cpp:123)
11  QtCLucene                     	0x000000010d2f0f43 QCLuceneIndexSearcher::QCLuceneIndexSearcher(QString const&) + 115 (IndexSearcher.h:65)
12  QtHelp                        	0x000000010d22000f fulltextsearch::clucene::QHelpSearchIndexWriter::run() + 3455 (qhelpsearchindexwriter_clucene.cpp:720)
13  QtCore                        	0x000000010d48da32 QThreadPrivate::start(void*) + 418 (qthread_unix.cpp:351)
14  libsystem_pthread.dylib       	0x00007fff87c50899 _pthread_body + 138
15  libsystem_pthread.dylib       	0x00007fff87c5072a _pthread_start + 137
16  libsystem_pthread.dylib       	0x00007fff87c54fc9 thread_start + 13

Thanks,
R.