diff --git a/lib/server.js b/lib/server.js
index 760b2694f..8b1889bb1 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -395,12 +395,12 @@ class Server extends KarmaEventEmitter {
     }
 
     processWrapper.on('unhandledRejection', (error) => {
-      this.log.error('UnhandledRejection')
+      this.log.error(`UnhandledRejection: ${error.message}`)
       reportError(error)
     })
 
     processWrapper.on('uncaughtException', (error) => {
-      this.log.error('UncaughtException')
+      this.log.error(`UncaughtException: ${error.message}`)
       reportError(error)
     })
   }