Cannot pretty print QJsonObject

[ChristopherPisz]

I get the following python errors when trying to view a QJsonObject in the debugger on CentOS7:

gdb.error: Cannot convert value to int.
Traceback (most recent call last):
  File "/opt/rh/devtoolset-8/root/usr/share/gdb/python/gdb/printing.py", line 218, in __call__
    return printer.gen_printer(val)
  File "/home/build/.gdb/qt5printers/core.py", line 397, in __init__
    self.printer = QMapPrinter(gdb.parse_and_eval('((QJsonObject*){:})->toVariantMap()'.format(int(val.address))))
gdb.error: Cannot convert value to int.