I already described problem here:
So I just copy from forum:
user edited map and somehow it become broken , looks like bug, but main problem here is how to restore map, just because zabbix doesn't show o export map:
I solved this by
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I don't know how user created problem, but I think this is wrong that map with such type of problem can't be opened without direct database interaction.
I think it will be better to warn user about problem but open map anyway, to let user correct problem, or any other solution, but using web interface.
Because there are no replies in forum I guess that only way to fix problem now is to directly fix database content.