Problem using poule, zero? error in scsh-process

Inserting the example code from poule into my existing project gives me the
error below. I'm compiling statically but that doesn't seem to be a problem
as I compiled the poule example statically and it worked fine. Everything
else in my program works fine. I'll work around this for now but I can try
any suggestions provided or dig deeper with any provided advice. Thanks.

Error: (zero?) bad argument type - not a number: #f

Call history:

/home/matt/data/hyphaworld/hmgr/build/dsjobs.scm:283: g2000
/home/matt/data/hyphaworld/hmgr/build/dsjobs.scm:283: g2000
/home/matt/data/hyphaworld/hmgr/build/dsjobs.scm:284: g2011
/home/matt/data/hyphaworld/hmgr/build/dsjobs.scm:284: g2028
scsh-process.scm:127: ##sys#call-with-values
scsh-process.scm:127: wait
scsh-process.scm:110: llrb-fixnum-table#table-ref/default
scsh-process.scm:151: scheme#call-with-current-continuation
scsh-process.scm:151: chicken.condition#with-exception-handler
scsh-process.scm:151: ##sys#call-with-values
scsh-process.scm:158: ##sys#call-with-values
scsh-process.scm:159: posix-process-wait
scsh-process.scm:168: scheme#values
scsh-process.scm:151: k147
scsh-process.scm:151: g150
scsh-process.scm:127: scheme#values   <--