#399

backend/app/controllers/post_imports_controller.rb

@@ -107,11 +107,14 @@ class PostImportsController < ApplicationController
         raise ArgumentError, 'タグ由来が大きすぎます．'
       end
 
+      source_row = Integer(normalised['source_row'], exception: false)
+      raise ArgumentError, '元行番号が不正です．' if source_row.nil? || source_row <= 0
+
+      normalised['source_row'] = source_row
       normalised.symbolize_keys
     end
     source_rows = normalised_rows.map { _1[:source_row] }
-    if source_rows.any? { |value| Integer(value, exception: false).to_i <= 0 } ||
-       source_rows.uniq.length != source_rows.length
+    if source_rows.uniq.length != source_rows.length
       raise ArgumentError, '元行番号が不正です．'
     end