diff --git a/Tests/test_imagestat.py b/Tests/test_imagestat.py
index 47e534696aa..014b642a632 100644
--- a/Tests/test_imagestat.py
+++ b/Tests/test_imagestat.py
@@ -65,6 +65,7 @@ def test_zero_count() -> None:
     st = ImageStat.Stat(im)
 
     assert st.mean == [0]
+    assert st.median == [0]
     assert st.rms == [0]
     assert st.var == [0]
 
diff --git a/src/PIL/ImageStat.py b/src/PIL/ImageStat.py
index 769c035b79b..2f818adc937 100644
--- a/src/PIL/ImageStat.py
+++ b/src/PIL/ImageStat.py
@@ -131,7 +131,7 @@ def median(self) -> list[int]:
         v = []
         for i in self.bands:
             s = 0
-            half = self.count[i] // 2
+            half = self.count[i] // 2 if self.count[i] else -1
             b = i * 256
             for j in range(256):
                 s = s + self.h[b + j]