updated corss-search export error handling

backend/src/routes/crossSearch.ts

@@ -124,10 +124,13 @@ router.get(`/export/:columnfilters/:sorting`, async (req, res) => {
     return res.status(403).send('Unknown error')
   }
 
-  res.attachment(`cross_search${currentDateAsString()}.csv`) // filename will get overwritten in frontend when fetching data from this route
   res.on('finish', () => {
     logger.info('Cross search export sent.')
   })
+  res.on('error', () => {
+    logger.info('ERROR!')
+  })
+  res.attachment(`cross_search${currentDateAsString()}.csv`) // filename will get overwritten in frontend when fetching data from this route
 
   // quoteColumns is needed to make sure linebreaks do not mess up the data
   const stream = format({ headers: true, quoteColumns: true }).transform(
@@ -142,6 +145,7 @@ router.get(`/export/:columnfilters/:sorting`, async (req, res) => {
     }
   })
 
+  try {
     for (const data of dataArray) {
       if (data) {
         for (const row of data) {
@@ -152,6 +156,11 @@ router.get(`/export/:columnfilters/:sorting`, async (req, res) => {
         }
       }
     }
+  } catch (error) {
+    logger.error(
+      'Error in crosssearch/export: Could not write to stream, user might have left the page or refreshed it.'
+    )
+  }
 
   return stream.end()
 })