diff --git a/src/mss/windows.py b/src/mss/windows.py
index a8c28d32..378ccad9 100644
--- a/src/mss/windows.py
+++ b/src/mss/windows.py
@@ -107,7 +107,7 @@ def __init__(self, /, **kwargs: Any) -> None:
 
         # Available thread-specific variables
         self._handles = local()
-        self._handles.region_width_height = (0, 0)
+        self._handles.region_width_height = None
         self._handles.bmp = None
         self._handles.srcdc = self.user32.GetWindowDC(0)
         self._handles.memdc = self.gdi32.CreateCompatibleDC(self._handles.srcdc)
diff --git a/src/tests/test_windows.py b/src/tests/test_windows.py
index 3f247ca8..0ec223b5 100644
--- a/src/tests/test_windows.py
+++ b/src/tests/test_windows.py
@@ -96,3 +96,10 @@ def test_thread_safety_regions():
     thread2.start()
     thread1.join()
     thread2.join()
+
+
+def test_region_zero():
+    """The region grab size 0."""
+    with mss.mss() as sct:
+        region0 = {"top": 0, "left": 0, "width": 0, "height": 0}
+        sct.grab(region0)