diff --git a/.github/actions/pull-requests/check-title/main.js b/.github/actions/pull-requests/check-title/main.js
index 4cf86eb5cd..ddbba44804 100644
--- a/.github/actions/pull-requests/check-title/main.js
+++ b/.github/actions/pull-requests/check-title/main.js
@@ -12,7 +12,7 @@ debug(`Available challenge numbers: ${challenges}`)
 debug(`Available names of programming languages: ${languageNames}`)
 
 const challengesJoined = challenges.join('|')
-const languageNamesJoined = languageNames.join('|')
+const languageNamesJoined = languageNames.join('|').replaceAll('+', '\\+')
 
 // Regular expressions
 const challengeRegex = new RegExp(`#(${challengesJoined})`)
diff --git a/.github/workflows/check-pull-request.yml b/.github/workflows/check-pull-request.yml
index 87abaa73c4..92677d0246 100644
--- a/.github/workflows/check-pull-request.yml
+++ b/.github/workflows/check-pull-request.yml
@@ -31,6 +31,8 @@ jobs:
     steps:
       - name: Clone repository to virtual machine
         uses: actions/checkout@v4
+        with:
+            ref: ${{ github.event.pull_request.base.ref }}
       - name: Check title of the pull request
         uses: ./.github/actions/pull-requests/check-title
         with:
@@ -45,6 +47,8 @@ jobs:
     steps:
       - name: Clone repository to virtual machine
         uses: actions/checkout@v4
+        with:
+            ref: ${{ github.event.pull_request.base.ref }}
       - name: Check committed files of the pull request
         id: changed-files
         uses: ./.github/actions/pull-requests/check-committed-files
@@ -58,6 +62,8 @@ jobs:
     steps:
       - name: Clone repository to virtual machine
         uses: actions/checkout@v4
+        with:
+            ref: ${{ github.event.pull_request.base.ref }}
       - name: Check committed file of the pull request
         uses: ./.github/actions/pull-requests/check-committed-file
         with: