PyPlot crashes when Gadfly is in same workspace

Steps to reproduce are below:

_
_ _ _(_)_ | A fresh approach to technical computing
(_) | (_) (_) | Documentation: https://docs.julialang.org
_ _ _| |_ __ _ | Type "?help" for help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 0.6.0 (2017-06-19 13:05 UTC)
_/ |\__'_|_|_|\__'_| | Official http://julialang.org/ release
|__/ | x86_64-apple-darwin13.4.0

julia> import Gadfly
WARNING: Method definition midpoints(Base.Range{T} where T) in module Base at deprecated.jl:56 overwritten in module StatsBase at /Users/livingston/.julia/v0.6/StatsBase/src/hist.jl:535.
WARNING: Method definition midpoints(AbstractArray{T, 1} where T) in module Base at deprecated.jl:56 overwritten in module StatsBase at /Users/livingston/.julia/v0.6/StatsBase/src/hist.jl:533.

julia> import PyPlot

julia> PyPlot.figure()
2018-02-27 17:15:35.229 julia[32851:1569035] -[__NSCFType symbolicTraits]: unrecognized selector sent to instance 0x7fa0eb7d5f70
2018-02-27 17:15:35.231 julia[32851:1569035] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFType symbolicTraits]: unrecognized selector sent to instance 0x7fa0eb7d5f70'
*** First throw call stack:
(
0 CoreFoundation 0x00007fffccc362cb __exceptionPreprocess + 171
1 libobjc.A.dylib 0x00007fffe1a4d48d objc_exception_throw + 48
2 CoreFoundation 0x00007fffcccb7f04 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x00007fffccba8755 ___forwarding___ + 1061
4 CoreFoundation 0x00007fffccba82a8 _CF_forwarding_prep_0 + 120
5 AppKit 0x00007fffca842daf -[NSFontManager traitsOfFont:] + 37
6 libtk8.6.dylib 0x0000000127ee2083 TkpFontPkgInit + 243
7 libtk8.6.dylib 0x0000000127e3a932 TkCreateMainWindow + 194
8 libtk8.6.dylib 0x0000000127e45ec6 CreateFrame + 758
9 libtk8.6.dylib 0x0000000127e464a7 TkListCreateFrame + 151
10 libtk8.6.dylib 0x0000000127e3e049 Initialize + 2153
11 _tkinter.so 0x0000000127c65be4 Tcl_AppInit + 84
12 _tkinter.so 0x0000000127c65448 Tkinter_Create + 1128
13 libpython2.7.dylib 0x0000000125ebf8f4 PyEval_EvalFrameEx + 22980
14 libpython2.7.dylib 0x0000000125eb9cd4 PyEval_EvalCodeEx + 2164
15 libpython2.7.dylib 0x0000000125e3bbb3 function_call + 355
16 libpython2.7.dylib 0x0000000125e134d5 PyObject_Call + 101
17 libpython2.7.dylib 0x0000000125e22642 instancemethod_call + 162
18 libpython2.7.dylib 0x0000000125e134d5 PyObject_Call + 101
19 libpython2.7.dylib 0x0000000125ec3a2f PyEval_CallObjectWithKeywords + 159
20 libpython2.7.dylib 0x0000000125e205d4 PyInstance_New + 148
21 libpython2.7.dylib 0x0000000125e134d5 PyObject_Call + 101
22 libpython2.7.dylib 0x0000000125ebf578 PyEval_EvalFrameEx + 22088
23 libpython2.7.dylib 0x0000000125eb9cd4 PyEval_EvalCodeEx + 2164
24 libpython2.7.dylib 0x0000000125ec401d fast_function + 109
25 libpython2.7.dylib 0x0000000125ebf399 PyEval_EvalFrameEx + 21609
26 libpython2.7.dylib 0x0000000125eb9cd4 PyEval_EvalCodeEx + 2164
27 libpython2.7.dylib 0x0000000125e3bbb3 function_call + 355
28 libpython2.7.dylib 0x0000000125e134d5 PyObject_Call + 101
29 libpython2.7.dylib 0x0000000125ec0600 PyEval_EvalFrameEx + 26320
30 libpython2.7.dylib 0x0000000125eb9cd4 PyEval_EvalCodeEx + 2164
31 libpython2.7.dylib 0x0000000125e3bbb3 function_call + 355
32 libpython2.7.dylib 0x0000000125e134d5 PyObject_Call + 101
33 ??? 0x000000011bfa50b0 0x0 + 4764356784
34 ??? 0x000000011bfa4ad2 0x0 + 4764355282
35 ??? 0x000000011bfae643 0x0 + 4764395075
36 ??? 0x000000011bfae4df 0x0 + 4764394719
37 libjulia.0.6.0.dylib 0x0000000104460ab8 do_call + 200
38 libjulia.0.6.0.dylib 0x000000010445eb12 eval + 882
39 libjulia.0.6.0.dylib 0x000000010445e791 jl_interpret_toplevel_expr + 49
40 libjulia.0.6.0.dylib 0x0000000104474a16 jl_toplevel_eval_flex + 1862
41 libjulia.0.6.0.dylib 0x000000010445909b jl_toplevel_eval_in + 523
42 sys.dylib 0x00000001087022da julia_eval_17977 + 10
43 sys.dylib 0x00000001087022f0 jlcall_eval_17976 + 16
44 sys.dylib 0x0000000108774ba2 julia_eval_user_input_20273 + 594
45 sys.dylib 0x0000000108774dc0 jlcall_eval_user_input_20272 + 16
46 ??? 0x000000011bf589f0 0x0 + 4764043760
47 ??? 0x000000011bf58c80 0x0 + 4764044416
48 libjulia.0.6.0.dylib 0x0000000104464f3c start_task + 364
)
libc++abi.dylib: terminating with uncaught exception of type NSException

signal (6): Abort trap: 6
while loading no file, in expression starting on line 0
__pthread_kill at /usr/lib/system/libsystem_kernel.dylib (unknown line)
Allocations: 9885190 (Pool: 9883324; Big: 1866); GC: 19
[1] 32851 abort julia

I am running Gadfly 0.6.5 and PyPlot 2.3.2 on Julia 0.6.0 (macOS Sierra).