diff --git a/project.py b/project.py
index 1d8ab556..50daa82f 100644
--- a/project.py
+++ b/project.py
@@ -2296,7 +2296,9 @@ class Project:
 
         try:
             rev = self.GetRevisionId()
-        except GitError:
+        except (GitError, ManifestInvalidRevisionError):
+            # The git repo may be outdated (i.e. not fetched yet) and querying
+            # its submodules using the revision may not work; so return here.
             return []
         return get_submodules(self.gitdir, rev)