1 files changed, 3 insertions, 1 deletions
diff --git a/lib/gitlab/ci/config/external/mapper/normalizer.rb b/lib/gitlab/ci/config/external/mapper/normalizer.rb
index 8fc798e78a0..b07726f7c11 100644
--- a/lib/gitlab/ci/config/external/mapper/normalizer.rb
+++ b/lib/gitlab/ci/config/external/mapper/normalizer.rb
@@ -25,8 +25,10 @@ module Gitlab
                   location = variables_expander.expand(location)
 
                   normalize_location_string(location)
-                else
+                elsif location.is_a?(Hash)
                   location.deep_symbolize_keys
+                else
+                  raise Mapper::InvalidTypeError, 'Each include must be a hash or a string'
                 end
               end
             end