Comment 2 for bug 1552577

StacktraceTop:
 _gtk_style_provider_private_get_settings (provider=0x0) at /build/gtk+3.0-qjgeoX/gtk+3.0-3.18.8/./gtk/gtkstyleproviderprivate.c:123
 gtk_css_value_initial_compute (value=<optimized out>, property_id=1, provider=0x0, style=0x194fd60, parent_style=0x0) at /build/gtk+3.0-qjgeoX/gtk+3.0-3.18.8/./gtk/gtkcssinitialvalue.c:52
 gtk_css_static_style_compute_value (style=0x194fd60, provider=0x0, parent_style=0x0, id=1, specified=0x7f3a02809cd0 <inherit>, section=0x0) at /build/gtk+3.0-qjgeoX/gtk+3.0-3.18.8/./gtk/gtkcssstaticstyle.c:232
 _gtk_css_lookup_resolve (lookup=lookup@entry=0x1961170, provider=provider@entry=0x0, style=style@entry=0x194fd60, parent_style=parent_style@entry=0x0) at /build/gtk+3.0-qjgeoX/gtk+3.0-3.18.8/./gtk/gtkcsslookup.c:125
 gtk_css_static_style_new_compute (provider=provider@entry=0x0, matcher=matcher@entry=0x0, parent=parent@entry=0x0) at /build/gtk+3.0-qjgeoX/gtk+3.0-3.18.8/./gtk/gtkcssstaticstyle.c:191