diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 6996ab51..22c8ec44 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -78,6 +78,7 @@ jobs:
           python3 scripts/ci/workflow.py clean-spm-cache
 
       - name: Boot simulator (async)
+        if: ${{ vars.ENABLE_TESTS == '1' && vars.ENABLE_TESTS_RUN == '1' }}
         run: |
           mkdir -p build/logs
           python3 scripts/ci/workflow.py boot-sim-async "iPhone 17 Pro"
diff --git a/scripts/ci/workflow.py b/scripts/ci/workflow.py
index 18ccb3b9..ef4399a6 100644
--- a/scripts/ci/workflow.py
+++ b/scripts/ci/workflow.py
@@ -78,8 +78,6 @@ def reserve_build_number(repo, max_attempts=5):
         version_json.write_text(json.dumps(data, indent=2) + "\n")
         return data
 
-    return json.loads(version_json.read_text())
-
     def write(data):
         version_json.write_text(json.dumps(data, indent=2) + "\n")