GenerateMask: 'list' object has no attribute 'split'

S1Tiling seems failing to generate some border masks. I really don't understand why, it works for some products, and fails for others. It looks like there is a bug somewhere, on parsing a file name or something like that.

DEBUG - Parameters for GenerateMask -> 
/home/ad/cressor/work/SENTINEL1/31TEJ/s1a_31TEJ_vh_ASC_161_20171223txxxxxx_BorderMask.tif from 
/home/ad/cressor/work/SENTINEL1/31TEJ/s1a_31TEJ_vh_ASC_161_20171223txxxxxx.tif: ([Failed to produce 
/home/ad/cressor/work/SENTINEL1/31TEJ/s1a_31TEJ_vh_ASC_161_20171223txxxxxx.tif because 
/home/ad/cressor/scratch/temp_s1_tiling_images/tmp_debug/S2/31TEJ/s1a_31TEJ_vh_ASC_161_20171223t173057.tif could not 
be produced: 'list' object has no attribute 'split'],)