[2015-07-17T19:59:10.307901 #12787] ERROR -- : PG::UniqueViolation: ERROR:  duplicate key value violates unique constraint "index_spree_products_on_slug"
DETAIL:  Key (slug)=() already exists.
: UPDATE "spree_products" SET "name" = $1, "slug" = $2, "description" = $3, "updated_at" = $4 WHERE "spree_products"."id" = $5
D, [2015-07-17T19:59:10.309119 #12787] DEBUG -- :    (0.8ms)  ROLLBACK
I, [2015-07-17T19:59:10.309855 #12787]  INFO -- : Completed 500 Internal Server Error in 182ms (ActiveRecord: 35.3ms)
F, [2015-07-17T19:59:10.314777 #12787] FATAL -- : 
ActiveRecord::RecordNotUnique (PG::UniqueViolation: ERROR:  duplicate key value violates unique constraint "index_spree_products_on_slug"
DETAIL:  Key (slug)=() already exists.
: UPDATE "spree_products" SET "name" = $1, "slug" = $2, "description" = $3, "updated_at" = $4 WHERE "spree_products"."id" = $5):
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