Version-Release number of selected component:
cmdline: ibus-daemon --xim --panel disable
runlevel: N 5
Thread no. 1 (10 frames)
#0 bus_engine_proxy_new_internal at engineproxy.c:677
#1 create_engine_ready_cb at engineproxy.c:755
#2 g_task_return_now at gtask.c:1148
#3 g_task_return at gtask.c:1206
#4 reply_cb at gdbusproxy.c:2596
#5 g_task_return_now at gtask.c:1148
#6 g_task_return at gtask.c:1206
#7 g_dbus_connection_call_done at gdbusconnection.c:5724
#8 g_task_return_now at gtask.c:1148
#9 complete_in_idle_cb at gtask.c:1162
Potential duplicate: bug 1410201
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I cannot reproduce your problem.
Seems BusEngineProxy is NULL in your ibus-daemon.
Are you still able to see your backtrace?
(In reply to Chen_Min_Chin from comment #1)
> Created attachment 1437652 [details]
> File: backtrace
#0 0x00005649bedff1c8 in bus_engine_proxy_new_internal (connection=<optimized out>, desc=0x5649bfda93c0 [IBusEngineDesc], path=0x7f980c01c9a0 "/org/freedesktop/IBus/Engine/1") at engineproxy.c:677
#1 0x00005649bedff1c8 in create_engine_ready_cb (factory=<optimized out>, res=<optimized out>, data=0x7f980c063c40) at engineproxy.c:755
#2 0x00007f9828d93cf4 in g_task_return_now (task=0x5649bfe3c530 [GTask]) at gtask.c:1148
#3 0x00007f9828d947a6 in g_task_return (task=0x5649bfe3c530 [GTask], type=<optimized out>) at gtask.c:1206
#4 0x00007f9828dd4abb in reply_cb (connection=<optimized out>, res=<optimized out>, user_data=0x5649bfe3c530) at gdbusproxy.c:2596
#5 0x00007f9828d93cf4 in g_task_return_now (task=0x7f980c01d4e0 [GTask]) at gtask.c:1148
#6 0x00007f9828d947a6 in g_task_return (task=0x7f980c01d4e0 [GTask], type=<optimized out>) at gtask.c:1206
#7 0x00007f9828dc940a in g_dbus_connection_call_done (source=<optimized out>, result=0x7f980c01d5b0, user_data=0x7f980c01d4e0) at gdbusconnection.c:5724
#8 0x00007f9828d93cf4 in g_task_return_now (task=0x7f980c01d5b0 [GTask]) at gtask.c:1148
#9 0x00007f9828d93d2d in complete_in_idle_cb (task=task@entry=0x7f980c01d5b0) at gtask.c:1162
#10 0x00007f98287e40eb in g_idle_dispatch (source=0x7f980c019340, callback=0x7f9828d93d20 <complete_in_idle_cb>, user_data=0x7f980c01d5b0) at gmain.c:5535
#11 0x00007f98287e77cd in g_main_dispatch (context=0x5649bfe30080) at gmain.c:3177
#12 0x00007f98287e77cd in g_main_context_dispatch (context=context@entry=0x5649bfe30080) at gmain.c:3830
#13 0x00007f98287e7b98 in g_main_context_iterate (context=0x5649bfe30080, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3903
#14 0x00007f98287e7ec2 in g_main_loop_run (loop=0x5649bfe4eac0) at gmain.c:4099
#15 0x00005649bee03d40 in bus_server_run () at server.c:195
#16 0x00005649bedf0dd8 in main (argc=<optimized out>, argv=<optimized out>) at main.c:314
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