yet another servo crash, look at lines 8-10

crash.log

Layout thread disconnected.: "SendError(..)" (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(1), index: PipelineIndex(25) }, at src/libcore/result.rs:997)
stack backtrace:
   0:     0x55de7800182d - backtrace::backtrace::trace::h80e1506fdb7f64cf
   1:     0x55de78001412 - <backtrace::capture::Backtrace as core::default::Default>::default::h955e897fd8cb3a3b
   2:     0x55de75d8f04f - servo::main::{{closure}}::h807a1983622452f9
   3:     0x55de78cd53c8 - rust_panic_with_hook
                        at src/libstd/panicking.rs:482
   4:     0x55de78cd4e61 - continue_panic_fmt
                        at src/libstd/panicking.rs:385
   5:     0x55de78cd4d45 - rust_begin_unwind
   6:     0x55de78cf45cc - panic_fmt
                        at src/libcore/panicking.rs:85
   7:     0x55de769f2a2d - core::result::unwrap_failed::hd564d9ddf13595fa
   8:     0x55de7647e296 - script::dom::window::Window::force_reflow::h26235d4375696a2c
   9:     0x55de7647e8d3 - script::dom::window::Window::reflow::hccf6b42450e086f0
  10:     0x55de7647f045 - script::dom::window::Window::client_rect_query::h7bfe1afa3d6deb39
  11:     0x55de76d447c7 - _ZN3std9panicking3try7do_call17h3a6062bb9ffd5618E.llvm.12133708668940354314
  12:     0x55de78cdff59 - __rust_maybe_catch_panic
                        at src/libpanic_unwind/lib.rs:87
  13:     0x55de769605de - script::dom::bindings::codegen::Bindings::ElementBinding::ElementBinding::get_clientWidth::h227048948672d2be
  14:     0x55de76bec0e4 - script::dom::bindings::utils::generic_call::hb2529985193abd95
  15:     0x55de76bec29e - script::dom::bindings::utils::generic_getter::hf04104fa497e65a7
  16:     0x55de78549d92 - _ZN2js12CallJSNativeEP9JSContextPFbS1_jPN2JS5ValueEERKNS2_8CallArgsE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/JSContext-inl.h:290
                         - _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/Interpreter.cpp:468
  17:     0x55de7854a22b - _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/Interpreter.cpp:536
                         - _ZN2js10CallGetterEP9JSContextN2JS6HandleINS2_5ValueEEES5_NS2_13MutableHandleIS4_EE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/Interpreter.cpp:651
  18:     0x55de781d2ad3 - CallGetter
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/NativeObject.cpp:2155
  19:     0x55de781e2756 - GetExistingProperty<(js::AllowGC)1>
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/NativeObject.cpp:2208
                         - NativeGetPropertyInline<(js::AllowGC)1>
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/NativeObject.cpp:2410
                         - _ZN2js17NativeGetPropertyEP9JSContextN2JS6HandleIPNS_12NativeObjectEEENS3_INS2_5ValueEEENS3_I4jsidEENS2_13MutableHandleIS7_EE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/NativeObject.cpp:2446
  20:     0x55de78533f2e - _ZN2js11GetPropertyEP9JSContextN2JS6HandleIP8JSObjectEENS3_INS2_5ValueEEENS3_I4jsidEENS2_13MutableHandleIS7_EE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/NativeObject.h:1629
                         - _ZN2js11GetPropertyEP9JSContextN2JS6HandleIP8JSObjectEENS3_INS2_5ValueEEEPNS_12PropertyNameENS2_13MutableHandleIS7_EE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/JSObject.h:821
                         - _ZN2js11GetPropertyEP9JSContextN2JS6HandleINS2_5ValueEEENS3_IPNS_12PropertyNameEEENS2_13MutableHandleIS4_EE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/Interpreter.cpp:4397
  21:     0x55de7853d45a - Interpret
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/Interpreter.cpp:214
  22:     0x55de785499c4 - _ZN2js9RunScriptEP9JSContextRNS_8RunStateE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/Interpreter.cpp:418
  23:     0x55de78549ef9 - _ZN2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstructE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/Interpreter.cpp:490
  24:     0x55de7854a83e - InternalCall
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/Interpreter.cpp:517
                         - _ZN2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_EE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/vm/Interpreter.cpp:536
  25:     0x55de780e8a67 - _Z20JS_CallFunctionValueP9JSContextN2JS6HandleIP8JSObjectEENS2_INS1_5ValueEEERKNS1_16HandleValueArrayENS1_13MutableHandleIS6_EE
                        at /home/spook/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.6/mozjs/js/src/jsapi.cpp:2970
  26:     0x55de7681f9a6 - script::dom::bindings::codegen::Bindings::FunctionBinding::Function::Call::hfdafb70dd38dc575
  27:     0x55de7681f4b3 - script::dom::bindings::codegen::Bindings::FunctionBinding::Function::Call_::hcc13691bba2a1e5f
  28:     0x55de76a76802 - script::timers::OneshotTimers::fire_timer::h923beee36375609d
  29:     0x55de76800c5e - script::script_thread::ScriptThread::handle_timer_event::he271db6d5db5c311
  30:     0x55de767f4b27 - _ZN6script13script_thread12ScriptThread11handle_msgs17h86061502dcfcaba3E.llvm.14774502840267740382
  31:     0x55de769bd687 - profile_traits::mem::ProfilerChan::run_with_memory_reporting::hc3c5327fc8598a7a
  32:     0x55de76720c54 - std::sys_common::backtrace::__rust_begin_short_backtrace::h9fd593bab5b87f1b
  33:     0x55de76d38285 - _ZN3std9panicking3try7do_call17h13bd13d1d1381e9bE.llvm.12133708668940354314
  34:     0x55de78cdff59 - __rust_maybe_catch_panic
                        at src/libpanic_unwind/lib.rs:87
  35:     0x55de769f3877 - <F as alloc::boxed::FnBox<A>>::call_box::h2a68ba0c45f874ef
  36:     0x55de78cdf2bd - call_once<(),()>
                        at /rustc/0ea22717a1e01fa535534b85a5347a7e49fc79de/src/liballoc/boxed.rs:759
                         - start_thread
                        at src/libstd/sys_common/thread.rs:14
                         - thread_start
                        at src/libstd/sys/unix/thread.rs:80
  37:     0x7faeaf36ba9c - start_thread
  38:     0x7faeaebf6b22 - clone
  39:                0x0 - <unknown>
[2019-03-18T17:00:44Z ERROR servo] Layout thread disconnected.: "SendError(..)"