diff --git a/src/simple_github/auth.py b/src/simple_github/auth.py
index 632e076..d2bc58e 100644
--- a/src/simple_github/auth.py
+++ b/src/simple_github/auth.py
@@ -144,7 +144,7 @@ async def _get_installation_id(self) -> str:
         assert isinstance(installations, list)
 
         for installation in installations:
-            if installation["account"]["login"] == self.owner:
+            if installation["account"].get("login") == self.owner:
                 return installation["id"]
 
         raise Exception(