Update ekka to version 0.15.8, mria to version 0.15.8, and optvar to 1.0.5. This fixes occasional assertion failures: {{badmatch,noproc},[{optvar,read,2,[{file,"optvar.erl"},{line,140}]},{optvar,read,1,[{file,"optvar.erl"},{line,124}]},...
{{badmatch,noproc},[{optvar,read,2,[{file,"optvar.erl"},{line,140}]},{optvar,read,1,[{file,"optvar.erl"},{line,124}]},...