diff --git a/perf/perfkit/gen/grow.py b/perf/perfkit/gen/grow.py
index 005cd0b..0675a3f 100644
--- a/perf/perfkit/gen/grow.py
+++ b/perf/perfkit/gen/grow.py
@@ -60,11 +60,27 @@ async def grow_vsp_sheet(api: Api, form_id: int, sheet: str, need: int, org_inde
     return need
 
 
+def form4_ids(rows: list[dict]) -> tuple[list[int], list[int]]:
+    """(vsp_ids, project_ids) из строк листа FORM_4; отсутствующие ключи (data/header/vsp_id/project_id) пропускаются."""
+    vsp_ids: set[int] = set()
+    project_ids: set[int] = set()
+    for r in rows:
+        header = (r.get("data") or {}).get("header") or {}
+        if r.get("row_type") == "INPUT":
+            vid = header.get("vsp_id")
+            if vid is not None:
+                vsp_ids.add(vid)
+        elif r.get("row_type") == "ITEM":
+            pid = header.get("project_id")
+            if pid is not None:
+                project_ids.add(pid)
+    return sorted(vsp_ids), sorted(project_ids)
+
+
 async def grow_form4_sheet(api: Api, form_id: int, sheet: str, need: int) -> int:
     path = f"/form/{form_id}/sheet/{sheet}"
     rows = (await api.get(path))["result"]
-    vsp_ids = sorted({r["data"]["header"]["vsp_id"] for r in rows if r.get("row_type") == "INPUT" and r["data"]["header"].get("vsp_id")})
-    project_ids = sorted({r["data"]["header"]["project_id"] for r in rows if r.get("row_type") == "ITEM"})
+    vsp_ids, project_ids = form4_ids(rows)
     if not project_ids:
         raise RuntimeError(f"{sheet}: нет проектов")
     leaves = await leaf_items(api, "FORM_4", sheet)
diff --git a/perf/tests/test_gen_grow.py b/perf/tests/test_gen_grow.py
index 1b4aa4e..70e7d6e 100644
--- a/perf/tests/test_gen_grow.py
+++ b/perf/tests/test_gen_grow.py
@@ -1,6 +1,6 @@
 import pytest
 
-from perfkit.gen.grow import rows_to_add, TARGETS
+from perfkit.gen.grow import form4_ids, rows_to_add, TARGETS
 
 
 @pytest.mark.parametrize("cur,target,exp", [(31, 500, 469), (110, 300, 190), (500, 500, 0), (700, 500, 0), (0, 5, 5)])
@@ -12,3 +12,15 @@ def test_targets_do_not_touch_small_pair_sheets():
     # AHR_RENT и FORM_4/AHR остаются малыми (пара для @big)
     assert ("FORM_2", "AHR_RENT") not in [(f, s) for f, s, _ in TARGETS]
     assert ("FORM_4", "AHR") not in [(f, s) for f, s, _ in TARGETS]
+
+
+def test_form4_ids_tolerates_absent_keys():
+    rows = [
+        {"row_type": "INPUT", "data": {"header": {"vsp_id": 3}}},
+        {"row_type": "INPUT", "data": {"header": {}}},
+        {"row_type": "INPUT", "data": {}},
+        {"row_type": "ITEM", "data": {"header": {"project_id": 11}}},
+        {"row_type": "ITEM", "data": {"header": {}}},
+        {"row_type": "ITEM", "data": {}},
+    ]
+    assert form4_ids(rows) == ([3], [11])