diff --git a/osc/core.py b/osc/core.py
index 0b213488..297a8741 100644
--- a/osc/core.py
+++ b/osc/core.py
@@ -3975,7 +3975,7 @@ def get_repos_of_project(apiurl: str, prj: str):
 
     project_obj = obs_api.Project.from_api(apiurl, prj)
     for repo in project_obj.repository_list or []:
-        for arch in repo.arch_list:
+        for arch in repo.arch_list or []:
             yield Repo(repo.name, arch)