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In the title compound, (C5H5ClN)2[NiCl4], the dianion lies on a twofold rotation axis. Two cations are linked to each anion by classical N—H...Cl hydrogen bonds, and short Cl...Cl contacts and Cl...π stacking interactions [with distances of 3.376 (2) and 3.684 (2) Å, respectively] extend this pattern into a chain. The [NiCl4]2− anion shows significant deviation from ideal tetrahedral geometry.