Segfault in DataStructures.jl

I am getting the following segfault in the midst of some other code:

signal (11): Segmentation fault: 11
in expression starting at REPL[67]:1
gc_mark_loop at /Applications/ (unknown line)
_jl_gc_collect at /Applications/ (unknown line)
ijl_gc_collect at /Applications/ (unknown line)
jl_gc_pool_alloc_inner at /Applications/ (unknown line)
jl_gc_alloc at /Applications/ (unknown line)
ijl_new_bits at /Applications/ (unknown line)
ijl_get_nth_field at /Applications/ (unknown line)
ijl_get_nth_field_checked at /Applications/ (unknown line)
jl_f_getfield at /Applications/ (unknown line)
getproperty at ./Base.jl:38 [inlined]
setindex! at /Users/josephbradley/.julia/packages/DataStructures/59MD0/src/delegate.jl:37 [inlined]

I can’t share an easy MWE but ATM I’m just looking for advice on how to go about debugging the segfault, and wondering if anyone else has had similar crashes with DataStructures.jl/Base in the past?