diff --git a/M01_MasterData/M01_MasterData_Store.py b/M01_MasterData/M01_MasterData_Store.py
index 3babd1fd..bb40ca84 100644
--- a/M01_MasterData/M01_MasterData_Store.py
+++ b/M01_MasterData/M01_MasterData_Store.py
@@ -548,6 +548,7 @@ def calc(key: str, inputs: dict, row: dict | None = None, file: str | None = Non
     if row is not None:
         key = _swap(files, str(row.get("키") or key), row, file)
     try:
+        given = cm.mf.fill_empty(cm.mf.Master(files).logic(key), given)
         result = cm.calc(files, key, given)
     except (cm.mf.FormulaError, ArithmeticError, KeyError, TypeError, ValueError) as e:
         return {"ok": False, "reason": str(e) or type(e).__name__}
@@ -577,6 +578,7 @@ def text(key: str, inputs: dict, row: dict | None = None, file: str | None = Non
     if row is not None:
         key = _swap(files, str(row.get("키") or key), row, file)
     try:
+        given = cm.mf.fill_empty(cm.mf.Master(files).logic(key), given)
         return mtx.lines(files, key, given)
     except (cm.mf.FormulaError, ArithmeticError, KeyError, TypeError, ValueError) as e:
         return {"ok": False, "reason": str(e) or type(e).__name__}
diff --git a/resources/master_data/scripts/master_formula.py b/resources/master_data/scripts/master_formula.py
index b31581e1..14f6e88c 100644
--- a/resources/master_data/scripts/master_formula.py
+++ b/resources/master_data/scripts/master_formula.py
@@ -449,6 +449,16 @@ def cut(row: dict, value: Decimal, on: str) -> Decimal:
     return _round(value, rule.get("자리") or 0, way)
 
 
+def fill_empty(row: dict, given: dict) -> dict:
+    """화면이 안 보낸 가격 입력(단위에 「원」)은 null 로 채움 — 빈 입력과 같이 그 줄만 비움."""
+    gap = {
+        s["이름"]: None
+        for s in row.get("입력", [])
+        if s["이름"] not in given and "원" in str(s.get("단위") or "")
+    }
+    return {**given, **gap}
+
+
 def _inputs(row: dict, given: dict) -> dict:
     env = {}
     for spec in row.get("입력", []):
diff --git a/resources/tester/test_m01_auto.py b/resources/tester/test_m01_auto.py
index 7f2c1432..3201ff34 100644
--- a/resources/tester/test_m01_auto.py
+++ b/resources/tester/test_m01_auto.py
@@ -111,3 +111,16 @@ def test_빈_입력을_쓰는_줄만_비움(client) -> None:
     rest = sum(Decimal(str(one["금액"])) for one in got["lines"] if one["금액"] is not None)
     assert Decimal(str(got["sums"]["계"])) == rest > 0  # 빈 줄은 빼고 더함
     assert got["sums"]["경비"] == 0
+
+
+def test_빠진_원_입력도_null_처럼_줄만_비움(client) -> None:
+    given = {
+        k: v
+        for k, v in _auto(client, "GF000056").items()
+        if k not in ("체인톱가격", "체인오일단가")
+    }
+    for path in ("calc", "text"):
+        got = client.post(f"/api/m01/{path}", json={"key": "GF000056", "inputs": given}).json()
+        assert got["ok"] is True, (path, got)
+    lines = client.post("/api/m01/calc", json={"key": "GF000056", "inputs": given}).json()["lines"]
+    assert {o["이름"] for o in lines if o.get("까닭")} == {"체인오일", "체인톱 손료"}