diff --git a/.github/workflows/github-actions.yml b/.github/workflows/github-actions.yml
index 4a9c0d7..c8d1418 100644
--- a/.github/workflows/github-actions.yml
+++ b/.github/workflows/github-actions.yml
@@ -31,6 +31,9 @@ jobs:
           - python: '3.12'
             os: ubuntu-latest
             tox_env: 'build'
+          - python: '3.7'
+            os: ubuntu-22.04
+            tox_env: ["py,codecov"]
         exclude:
           # macos-14 AKA macos-latest has switched to being an ARM runner, only supporting newer versions of Python
           # https://github.com/actions/setup-python/issues/825#issuecomment-2096792396
@@ -42,6 +45,8 @@ jobs:
             os: macos-latest
           - python: '3.10'
             os: macos-latest
+          - python: '3.7'
+            os: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v3
diff --git a/src/travis2docker/cli.py b/src/travis2docker/cli.py
index 06fc8f4..2d0eb5b 100644
--- a/src/travis2docker/cli.py
+++ b/src/travis2docker/cli.py
@@ -42,11 +42,12 @@ def get_git_data(project, path, revision):
 
 def yml_read(yml_path):
     yml_path_expanded = expandvars(expanduser(yml_path))
+    alt_yml_path_expanded = None
     if isdir(yml_path_expanded):
         yml_path_expanded = join(yml_path_expanded, '.travis.yml')
         alt_yml_path_expanded = join(yml_path_expanded, '.t2d.yml')
     if not isfile(yml_path_expanded):
-        if isfile(alt_yml_path_expanded):
+        if alt_yml_path_expanded and isfile(alt_yml_path_expanded):
             yml_path_expanded = alt_yml_path_expanded
         else:
             return