diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index f7a9e9c683..25f3bba70a 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -786,7 +786,8 @@ module Homebrew
             !previous_revision.nil? &&
             current_revision < previous_revision
         problem "revision should not decrease (from #{previous_revision} to #{current_revision})"
-      elsif current_revision > (newest_committed_revision + 1)
+      elsif newest_committed_revision &&
+            current_revision > (newest_committed_revision + 1)
         problem "revisions should only increment by 1"
       end
     end