diff --git a/lib/tasks/migrate_from_mantis.rake b/lib/tasks/migrate_from_mantis.rake
index 5f9663a39..bf3c32ccd 100644
--- a/lib/tasks/migrate_from_mantis.rake
+++ b/lib/tasks/migrate_from_mantis.rake
@@ -460,6 +460,14 @@ task :migrate_from_mantis => :environment do
   end
   
   puts
+  if Redmine::DefaultData::Loader.no_data?
+    puts "Redmine configuration need to be loaded before importing data."
+    puts "Please, run this first:"
+    puts
+    puts "  rake redmine:load_default_data RAILS_ENV=\"#{ENV['RAILS_ENV']}\""
+    exit
+  end
+  
   puts "WARNING: Your Redmine data will be deleted during this process."
   print "Are you sure you want to continue ? [y/N] "
   break unless STDIN.gets.match(/^y$/i)
diff --git a/lib/tasks/migrate_from_trac.rake b/lib/tasks/migrate_from_trac.rake
index d61640bfb..9ece2cf39 100644
--- a/lib/tasks/migrate_from_trac.rake
+++ b/lib/tasks/migrate_from_trac.rake
@@ -571,6 +571,14 @@ namespace :redmine do
     end
     
     puts
+    if Redmine::DefaultData::Loader.no_data?
+      puts "Redmine configuration need to be loaded before importing data."
+      puts "Please, run this first:"
+      puts
+      puts "  rake redmine:load_default_data RAILS_ENV=\"#{ENV['RAILS_ENV']}\""
+      exit
+    end
+    
     puts "WARNING: a new project will be added to Redmine during this process."
     print "Are you sure you want to continue ? [y/N] "
     break unless STDIN.gets.match(/^y$/i)