Unhelpful warning: Index 0 out of bounds for length 0

One of my decisions produced a warning, saying:

Skipped Decision Table Analysis of table 'status BT' because: Index 0 out of bounds for length 0

As a modeller, this doesn't give me any clue about what is going on, let aside what to do about it. I really appreciate any comment at compiletime, but it should be helpful. 

Here is the .dmn file containing the decision: hpa_HielprikAlgemeen.xlsx.dmn

Here is the .dmn file it includes: dt_datatypes.dmn