Comment 2 for bug 1273989

StacktraceTop:
 g_assertion_message (domain=domain@entry=0x4192b1 "IBUS", file=file@entry=0x41a861 "panel.c", line=line@entry=3477, func=func@entry=0x41b620 <__func__.54922> "panel_switch_engine", message=message@entry=0xd75400 "assertion failed: (i >= 0 && i < m_engines.length)") at /build/buildd/glib2.0-2.39.3/./glib/gtestutils.c:2352
 g_assertion_message_expr (domain=domain@entry=0x4192b1 "IBUS", file=file@entry=0x41a861 "panel.c", line=line@entry=3477, func=func@entry=0x41b620 <__func__.54922> "panel_switch_engine", expr=expr@entry=0x41ae60 "i >= 0 && i < m_engines.length") at /build/buildd/glib2.0-2.39.3/./glib/gtestutils.c:2367
 panel_switch_engine (self=0xb33310, i=<optimized out>, force=<optimized out>) at panel.c:3477
 panel_update_engines (self=0xb33310, unowned_engine_names=<optimized out>, unowned_engine_names_length1=<optimized out>, order_names=<optimized out>, order_names_length1=<optimized out>) at panel.c:3921
 panel_load_settings (self=0xb33310) at panel.c:1659