diff --git a/lib/redmine/scm/base.rb b/lib/redmine/scm/base.rb
index 43e8a1877..b33a9cfd1 100644
--- a/lib/redmine/scm/base.rb
+++ b/lib/redmine/scm/base.rb
@@ -4,7 +4,7 @@ module Redmine
       class << self
 
         def all
-          @scms
+          @scms || []
         end
 
         # Add a new SCM adapter and repository