Hi All Using\enabletrackers[paragraphs.passes=summary] whilst doing some testing causes a fatal error after first run but pdf is produced. Here is the error message from the MWE: lua error:         run callback [6]: bad argument #2 to 'format' (number expected, got nil) stack traceback:         [C]: in function 'string.format'         ?: in field '?' ...m64/tex/texmf-context/tex/context/base/mkxl/luat-log.lmt:184: in upvalue 'report' ...m64/tex/texmf-context/tex/context/base/mkxl/luat-log.lmt:397: in upvalue 'report' ...m64/tex/texmf-context/tex/context/base/mkxl/spac-pas.lmt:156: in field '?' ...m64/tex/texmf-context/tex/context/base/mkxl/luat-log.lmt:747: in field 'finalactions' ...m64/tex/texmf-context/tex/context/base/mkxl/luat-run.lmt:60: in function <...m64/tex/texmf-context/tex/context/base/mkxl/luat-run.lmt:56> mtx-context     | fatal error: return code: 1 %%%%%%%%%%%%%%%%%%%% Here is the MWE: \enabletrackers[paragraphs.passes=summary] \setupalignpass[optional1] \starttext \dorecurse{10}{ \input ward \input knuth \input darwin } \stoptext %%%%%%%%%%%%%%%%%%% Using the latest version: ConTeXt ver: 2023.07.09 19:38 LMTX fmt: 2023.7.10 int: english/english Best Wishes Keith