Thousands of non-Irish nationals in Co. Kildare who are not entitled to vote in the Lisbon referendum have inadvertently received polling cards to do so.
It is understood the county's local election data base was used for the distribution of polling cards which resulted in the blunder.
The error could cause mayhem at polling stations on Friday unless steps are taken to undo the damage.
The matter was brought to the attention of Labour TD for North Kildare Emmet Stagg by a local constituent.