diff --git a/canopen/pdo/base.py b/canopen/pdo/base.py
index 04f451d3..771ed5af 100644
--- a/canopen/pdo/base.py
+++ b/canopen/pdo/base.py
@@ -175,10 +175,12 @@ def __getitem__(self, key: int) -> PdoMap:
         try:
             return self.maps[key]
         except KeyError:
-            with contextlib.suppress(KeyError):
-                return self.maps[key + 1 - self.map_offset]
-            with contextlib.suppress(KeyError):
-                return self.maps[key + 1 - self.com_offset]
+            if self.map_offset:
+                with contextlib.suppress(KeyError):
+                    return self.maps[key + 1 - self.map_offset]
+            if self.com_offset:
+                with contextlib.suppress(KeyError):
+                    return self.maps[key + 1 - self.com_offset]
             raise
 
     def __iter__(self) -> Iterator[int]:
diff --git a/test/test_pdo.py b/test/test_pdo.py
index 4857ca7a..1b641147 100644
--- a/test/test_pdo.py
+++ b/test/test_pdo.py
@@ -80,6 +80,7 @@ def test_pdo_getitem(self):
         self.assertRaises(KeyError, lambda: node.pdo['DOES NOT EXIST'])
         self.assertRaises(KeyError, lambda: node.pdo[0x1BFF])
         self.assertRaises(KeyError, lambda: node.tpdo[0x1BFF])
+        self.assertRaises(KeyError, lambda: node.pdo[0x15FF])
 
     def test_pdo_iterate(self):
         node = self.node