diff --git a/src/apps/core/excel.py b/src/apps/core/excel.py
index 4645214..c725353 100644
--- a/src/apps/core/excel.py
+++ b/src/apps/core/excel.py
@@ -363,6 +363,8 @@ class BaseExcelParser(ABC, Generic[T]):
 
         self._workbook = openpyxl.load_workbook(content, read_only=True, data_only=True)
         self._sheet = self._workbook.active
+        if self._sheet.max_row is None or self._sheet.max_column is None:
+            self._sheet.calculate_dimension(force=True)
 
     def _parse_row(self, row_num: int) -> RowData | None:
         """Парсит одну строку Excel."""
diff --git a/tests/apps/core/test_excel.py b/tests/apps/core/test_excel.py
index 36423ba..398e2f8 100644
--- a/tests/apps/core/test_excel.py
+++ b/tests/apps/core/test_excel.py
@@ -1,6 +1,9 @@
 """Tests for core excel parser."""
 
+import re
+from io import BytesIO
 from unittest.mock import MagicMock
+from zipfile import ZIP_DEFLATED, ZipFile
 
 from apps.core.excel import (
     BaseExcelParser,
@@ -15,6 +18,7 @@ from apps.core.excel import (
     validate_okpo,
 )
 from django.test import TestCase
+from openpyxl import Workbook
 
 
 class ValidatorsTest(TestCase):
@@ -168,3 +172,48 @@ class BaseExcelParserTest(TestCase):
 
         self.assertEqual(len(mappings), 2)
         self.assertEqual(mappings[0].field_name, "inn")
+
+    def test_parse_recovers_missing_read_only_worksheet_dimension(self):
+        workbook = Workbook()
+        sheet = workbook.active
+        sheet.append(["Организация", "ОКПО", "ОГРН", "ИНН"])
+        sheet.append(
+            ["Тестовая организация", "12345678", "1234567890123", "1234567890"]
+        )
+        source = BytesIO()
+        workbook.save(source)
+        workbook.close()
+
+        source.seek(0)
+        without_dimension = BytesIO()
+        with ZipFile(source, "r") as input_archive, ZipFile(
+            without_dimension,
+            "w",
+            compression=ZIP_DEFLATED,
+        ) as output_archive:
+            for item in input_archive.infolist():
+                content = input_archive.read(item.filename)
+                if item.filename == "xl/worksheets/sheet1.xml":
+                    content = re.sub(rb"<dimension[^>]*/>", b"", content, count=1)
+                output_archive.writestr(item, content)
+        without_dimension.seek(0)
+
+        created_rows = []
+
+        class TestParser(BaseExcelParser):
+            def get_column_mappings(self):
+                return []
+
+            def get_next_batch_id(self) -> int:
+                return 1
+
+            def create_record(self, row_data, batch_id):
+                created_rows.append((row_data, batch_id))
+                return MagicMock()
+
+        result = TestParser().parse(without_dimension)
+
+        self.assertEqual(result.loaded_count, 1)
+        self.assertEqual(result.skipped_count, 0)
+        self.assertEqual(created_rows[0][0].organization_name, "Тестовая организация")
+        self.assertEqual(created_rows[0][1], 1)