Comment 2 for bug 1380982

StacktraceTop:
 g_assertion_message (domain=domain@entry=0x41ca51 "IBUS", file=file@entry=0x41de90 "panel.c", line=line@entry=2567, func=func@entry=0x41eec0 <__func__.55096> "panel_switch_engine", message=message@entry=0x2296990 "assertion failed: (i >= 0 && i < m_engines.length)") at /build/buildd/glib2.0-2.42.0/./glib/gtestutils.c:2291
 g_assertion_message_expr (domain=domain@entry=0x41ca51 "IBUS", file=file@entry=0x41de90 "panel.c", line=line@entry=2567, func=func@entry=0x41eec0 <__func__.55096> "panel_switch_engine", expr=expr@entry=0x41e498 "i >= 0 && i < m_engines.length") at /build/buildd/glib2.0-2.42.0/./glib/gtestutils.c:2306
 panel_switch_engine (self=0x2058280, i=<optimized out>, force=<optimized out>) at panel.c:2567
 panel_update_engines (self=0x2058280, unowned_engine_names=<optimized out>, unowned_engine_names_length1=<optimized out>, order_names=0x22533c0, order_names_length1=<optimized out>) at panel.c:3019
 panel_load_settings (self=0x2058280) at panel.c:2459