diff --git a/pysyge/pysyge.py b/pysyge/pysyge.py
index e12f806..5821ca5 100644
--- a/pysyge/pysyge.py
+++ b/pysyge/pysyge.py
@@ -146,7 +146,7 @@ def _search_idx(self, ipn: bytes, min_: int, max_: int) -> int:
 
                 min_ += 1
 
-                if min_ >= max_:
+                if min_ > max_:
                     break
 
         else:
diff --git a/tests/test_module.py b/tests/test_module.py
index 385f8d2..91d344e 100644
--- a/tests/test_module.py
+++ b/tests/test_module.py
@@ -27,6 +27,10 @@ def test_quirks():
     result = geodata.get_location('109.207.230.244')
     assert result['city'] == 'Калининград'
 
+    geodata = pysyge.GeoLocator(DATABASE_CITY_FILE, pysyge.MODE_BATCH)
+    result = geodata.get_location('109.252.119.71', detailed=True)
+    assert result['info']['city']['name_en'] == 'Moscow'
+
 
 class TestGeoLocatorBasicCheck: