diff --git a/Library/Homebrew/commands.rb b/Library/Homebrew/commands.rb
index d44418a0ce373f..932b280a6d6118 100644
--- a/Library/Homebrew/commands.rb
+++ b/Library/Homebrew/commands.rb
@@ -206,6 +206,8 @@ def self.command_description(command, short: false)
     return if path.blank?
 
     if (cmd_parser = Homebrew::CLI::Parser.from_cmd_path(path))
+      raise "#{path}\n#{cmd_parser.pretty_inspect}" if cmd_parser.description.nil?
+
       if short
         cmd_parser.description.split(DESCRIPTION_SPLITTING_PATTERN).first
       else