Error with Vimwiki: Range too large in character class

[yohannes]

Does anyone use Vimwiki with VMT? I just upgraded my instance of Vimwiki to 2.5 and now, any generated TOC link caused the following error when jumping to the item it points to:

Error Detected while processing function vimwiki#base#follow_link[69] .. vimwiki#base#open_link[34] .. vimwiki#base#edit_file[32] .. <SNR>46_jump_to_anchor[12] .. <SNR>46_jump_to_segment: 
line 23:
E945: Range to large in character class

However, I have no problem jumping from links generated by Vimwiki. Any pointer on how to investigate this error further?

Best,
Yohannes