Comment 2 for bug 1556993

StacktraceTop:
 g_variant_new_parsed_va () from /tmp/apport_sandbox_CF7We9/lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_variant_new_parsed () from /tmp/apport_sandbox_CF7We9/lib/x86_64-linux-gnu/libglib-2.0.so.0
 WebCore::PasteboardHelper::fillDataObjectFromDropData (this=<optimized out>, data=data@entry=0x7ffffe050c50, info=info@entry=6, dataObject=dataObject@entry=0x7fc31c41d750) at ../Source/WebCore/platform/gtk/PasteboardHelper.cpp:259
 WebCore::GtkDragAndDropHelper::handleDragDataReceived (this=<optimized out>, context=context@entry=0x241fd70, selectionData=selectionData@entry=0x7ffffe050c50, info=info@entry=6, position=...) at ../Source/WebCore/platform/gtk/GtkDragAndDropHelper.cpp:155
 webkit_web_view_drag_data_received (widget=0x1a60320, context=0x241fd70, x=<optimized out>, y=<optimized out>, selectionData=0x7ffffe050c50, info=6, time=18887829) at ../Source/WebKit/gtk/webkit/webkitwebview.cpp:1590