diff --git a/tests/ci/docker_images_check.py b/tests/ci/docker_images_check.py
index 773f3ac1b576..fb7228628fd5 100644
--- a/tests/ci/docker_images_check.py
+++ b/tests/ci/docker_images_check.py
@@ -164,7 +164,7 @@ def gen_versions(
     # The order is important, PR number is used as cache during the build
     versions = [str(pr_info.number), pr_commit_version]
     result_version = pr_commit_version
-    if pr_info.number == 0 and pr_info.base_name == "master":
+    if pr_info.number == 0 and pr_info.base_ref == "master":
         # First get the latest for cache
         versions.insert(0, "latest")
 
diff --git a/tests/ci/pr_info.py b/tests/ci/pr_info.py
index 77421ddac32c..dc016a7eed90 100644
--- a/tests/ci/pr_info.py
+++ b/tests/ci/pr_info.py
@@ -132,9 +132,13 @@ def __init__(
             self.commit_html_url = f"{repo_prefix}/commits/{self.sha}"
             self.pr_html_url = f"{repo_prefix}/pull/{self.number}"
 
+            # master or backport/xx.x/xxxxx - where the PR will be merged
             self.base_ref = github_event["pull_request"]["base"]["ref"]
+            # ClickHouse/ClickHouse
             self.base_name = github_event["pull_request"]["base"]["repo"]["full_name"]
+            # any_branch-name - the name of working branch name
             self.head_ref = github_event["pull_request"]["head"]["ref"]
+            # UserName/ClickHouse or ClickHouse/ClickHouse
             self.head_name = github_event["pull_request"]["head"]["repo"]["full_name"]
             self.body = github_event["pull_request"]["body"]
             self.labels = {