Oops, I goofed. Bonehead. It's the grid table that it's querying, not grid_entries. Had the wrong table left open after visualizing and investigating the problem.
Here's the correct query to execute for the workaround.
Replace the 123 with the actual zoneid of the zone that doesn't have any grid entry records yet:
Code:
INSERT INTO `grid` VALUES (0, 123, 0, 0);