diff --git a/Library/Homebrew/dev-cmd/create.rb b/Library/Homebrew/dev-cmd/create.rb
index 07dd1b3224f0e66ee4c84aefc519fc4e9cc8dca1..b4cda0fad51e5c9d3d23c818c38fc4a08c1305b3 100644
--- a/Library/Homebrew/dev-cmd/create.rb
+++ b/Library/Homebrew/dev-cmd/create.rb
@@ -142,12 +142,10 @@ class FormulaCreator
   def generate!
     raise "#{path} already exists" if path.exist?
 
-    if version.nil?
+    if version.nil? || version.null?
       opoo "Version cannot be determined from URL."
       puts "You'll need to add an explicit 'version' to the formula."
-    end
-
-    if fetch? && version
+    elsif fetch?
       r = Resource.new
       r.url(url)
       r.version(version)