Auto-numbering new page fail if warning selected in Office Connector Configuration

Steps to reproduce

1. Go to Administration >> Office Connector Configuration
2. Check the box for "Show a warning before allowing a user to perform an import" and submit
3. Create a page "Test"
4. Click on Tools >> Import Word Document
5. Import a Word document with the title "Test"
6. Import with the settings "Import as a new page in the current space" and "Rename imported pages if page name already exists"
7. There will be warning "Warning! You are about to create the following pages test0". However, "test0" is not created but the page "Test" is replaced.