Debian 10 TFS 0.4 r3884 compiling warning/error

[forumek]

I'm trying to compile TFS 0.4 r3884 on Debian 10 and I encountered this warning treated as an error

luascript.h: In member function ‘virtual bool Action::executeUse(Player*, Item*, const PositionEx&, const PositionEx&, bool, uint32_t)’:
luascript.h:279:106: error: ‘<anonymous>.PositionEx::stackpos’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  L, const PositionEx& position) {pushPosition(L, position, position.stackpos);}
                                                            ~~~~~~~~~^~~~~~~~

I don't know how to fix it