StacktraceTop:
g_type_check_instance_is_a () from /tmp/apport_sandbox_o4BcaN/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
gtk_widget_get_toplevel (widget=0x564d18311770) at ././gtk/gtkwidget.c:11521
window_group_cleanup_grabs (group=<optimized out>, window=window@entry=0x564d1869c350) at ././gtk/gtkwindowgroup.c:110
gtk_window_group_add_window (window_group=0x564d181e8250, window=0x564d1869c350) at ././gtk/gtkwindowgroup.c:169
gtk_window_set_transient_for (window=0x564d1869c350, parent=0x564d1860d660) at ././gtk/gtkwindow.c:3332
StacktraceTop: check_instance_ is_a () from /tmp/apport_ sandbox_ o4BcaN/ usr/lib/ x86_64- linux-gnu/ libgobject- 2.0.so. 0 get_toplevel (widget= 0x564d18311770) at ././gtk/ gtkwidget. c:11521 group_cleanup_ grabs (group=<optimized out>, window= window@ entry=0x564d186 9c350) at ././gtk/ gtkwindowgroup. c:110 group_add_ window (window_ group=0x564d181 e8250, window= 0x564d1869c350) at ././gtk/ gtkwindowgroup. c:169 set_transient_ for (window= 0x564d1869c350, parent= 0x564d1860d660) at ././gtk/ gtkwindow. c:3332
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