Infinite error message loop

I found this bug while welding a ship from blueprints. The player gets stuck in an error "Cannot find the blueprint file" as soon as the constructed grid is separated from the projecting grid, forcing the player to alt+F4. The projector and the grid being built are on the same subgrid, (separated by 4 pistons from the welder).

For reproduction purposes: note that just before this bug occurred, I saved a new version of the blueprint in question. When saving, I used the same name (except that I swapped a capital letter out for lower case). The blueprint was saved under the old name (with a capital letter), but the game didn't ask me to overwrite. I built the grid from the new blueprint. As soon as the merge block connecting the 'printer' and the constructed grid was turned off, the game went into the infinite error loop.

EDIT: Changing the name of the affected ship or creating a new blueprint didn't fix it. It seems like the game gets stuck because the building projector tries to load the blueprint again as soon as the merge block is disconnected (the projector is set to not keep the projection when completed). The issue is resolved if the 'Keep Projection' option is used on the projector.