ArgumentError in FrontendController#print_courseplan

invalid date

Extracted source (around line #375):
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excluded_dates.each do |date_string|
date = Date.strptime(date_string, "%d.%m.%Y")
if current_date == date
print_course = false
end

Rails.root: /var/www/clients/client1/web1/web/www

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Request

Parameters:

None

Response

Headers:

None