diff --git a/bin/app-json.py b/bin/app-json.py
index f361de6..09d9c8e 100755
--- a/bin/app-json.py
+++ b/bin/app-json.py
@@ -168,7 +168,11 @@ def get_app_versions(app_path, cached_apps_json):
     initial_branch = _run_cmd("git rev-parse --abbrev-ref HEAD")
 
     app_name = basename(app_path)
-    existing_tags = cached_apps_json[app_name]["versions"].keys()
+
+    try:
+        existing_tags = cached_apps_json[app_name]["versions"].keys()
+    except KeyError:
+        existing_tags = []
 
     for tag in tags:
         if tag in existing_tags: