fixed thanks to @durango

@@ -3,9 +3,7 @@
 
 exports = module.exports = function(logger, settings) {
   var knex = require('knex')(settings.knex)
-  knex.on('error', function(err) {
-    logger.error(err)
-  })
+  knex.on('error', logger.error)
   return knex
 }