Description:
1) Open a new writer document
2) Insert > Table of contents and Index > Table of contents...
3) Select: Type > Alphabetical Index and push OK
4) LibreOffice crashes. This messagebox is shown:

wrapped std::eception vector::_M_range_check:__n (which is 0) >= this->size() (which is 0)

I need an Alphabetical Index! 
Thank you very much for your kind work.

Steps to Reproduce:
1) Open a new writer document
2) Insert > Table of contents and Index > Table of contents...
3) Select: Type > Alphabetical Index and push OK
4) LibreOffice crashes. This messagebox is shown:

wrapped std::eception vector::_M_range_check:__n (which is 0) >= this->size() (which is 0)


Actual Results:  
LibreOffice crashes

Expected Results:
Insertion of Alphabetical Index


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
None


User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36