"них" meaning in Ukrainian

{
  "forms": [
    {
      "form": "nyx",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "uk",
        "2": "pronoun form",
        "head": "них"
      },
      "expansion": "них • (nyx)",
      "name": "head"
    }
  ],
  "lang": "Ukrainian",
  "lang_code": "uk",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ukrainian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "voný",
          "word": "вони́"
        }
      ],
      "glosses": [
        "genitive/accusative/locative of вони́ (voný)"
      ],
      "id": "en-них-uk-pron-cAUlQy3R",
      "links": [
        [
          "вони́",
          "вони#Ukrainian"
        ]
      ],
      "synonyms": [
        {
          "english": "when not used after a preposition",
          "roman": "jix",
          "word": "їх"
        }
      ],
      "tags": [
        "accusative",
        "form-of",
        "genitive",
        "locative"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[nɪx]"
    }
  ],
  "word": "них"
}

{
  "forms": [
    {
      "form": "nyx",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "uk",
        "2": "pronoun form",
        "head": "них"
      },
      "expansion": "них • (nyx)",
      "name": "head"
    }
  ],
  "lang": "Ukrainian",
  "lang_code": "uk",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        "Ukrainian entries with incorrect language header",
        "Ukrainian non-lemma forms",
        "Ukrainian pronoun forms",
        "Ukrainian terms with IPA pronunciation",
        "Ukrainian terms with redundant head parameter"
      ],
      "form_of": [
        {
          "extra": "voný",
          "word": "вони́"
        }
      ],
      "glosses": [
        "genitive/accusative/locative of вони́ (voný)"
      ],
      "links": [
        [
          "вони́",
          "вони#Ukrainian"
        ]
      ],
      "tags": [
        "accusative",
        "form-of",
        "genitive",
        "locative"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[nɪx]"
    }
  ],
  "synonyms": [
    {
      "english": "when not used after a preposition",
      "roman": "jix",
      "word": "їх"
    }
  ],
  "word": "них"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: when used after a preposition",
  "path": [
    "них"
  ],
  "section": "Ukrainian",
  "subsection": "pronoun",
  "title": "них",
  "trace": ""
}