psiTurk: python3 macosx Malloc error when entering any shell command?

After opening psiturk, server on yields the following error:

[psiTurk server:off mode:sdbx #HITs:0]$ server on
Python(80217,0x1108bc5c0) malloc: *** error for object 0x109f05040: pointer being freed was not allocated
Python(80217,0x1108bc5c0) malloc: *** set a breakpoint in malloc_error_break to debug
Abort trap: 6

I’ve tried using virtualenv to run psiturk in both Python 2.7.16 and 3.7.4 but the error is the same. Thanks in advance.