Fixed Magento2 Attribute option does not validate for existing records before insert

app/code/Magento/Eav/Setup/EavSetup.php

@@ -929,14 +929,26 @@ public function addAttributeOption($option)
                 }
             }
         } elseif (isset($option['values'])) {
-            foreach ($option['values'] as $sortOrder => $label) {
-                // add option
-                $data = ['attribute_id' => $option['attribute_id'], 'sort_order' => $sortOrder];
-                $this->setup->getConnection()->insert($optionTable, $data);
-                $intOptionId = $this->setup->getConnection()->lastInsertId($optionTable);
-
-                $data = ['option_id' => $intOptionId, 'store_id' => 0, 'value' => $label];
-                $this->setup->getConnection()->insert($optionValueTable, $data);
+                foreach ($option['values'] as $sortOrder => $label) {
+                    $select = $this->setup->getConnection()->select()->from(['optionTable' => $optionTable])->join(
+                    ['optionValueTable' => $optionValueTable],
+                    'optionTable.option_id = optionValueTable.option_id'
+                )->where(
+                    'optionTable.attribute_id =?', $option['attribute_id']
+                )->where(
+                    'optionValueTable.value = ?',$label
+                );
+                $row = $this->setup->getConnection()->fetchRow($select);
+
+                if (!$row) {
+                    // add option
+                    $data = ['attribute_id' => $option['attribute_id'], 'sort_order' => $sortOrder];
+                    $this->setup->getConnection()->insert($optionTable, $data);
+                    $intOptionId = $this->setup->getConnection()->lastInsertId($optionTable);
+
+                    $data = ['option_id' => $intOptionId, 'store_id' => 0, 'value' => $label];
+                    $this->setup->getConnection()->insert($optionValueTable, $data);
+                }
             }
         }
     }