diff --git a/lib/server.js b/lib/server.js
index 238caa09c..7c1d9224e 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -417,12 +417,12 @@ class Server extends KarmaEventEmitter {
     }
 
     processWrapper.on('unhandledRejection', (error) => {
-      this.log.error(`UnhandledRejection: ${error.message || String(error)}`)
+      this.log.error(`UnhandledRejection: ${error.stack || error.message || String(error)}`)
       reportError(error)
     })
 
     processWrapper.on('uncaughtException', (error) => {
-      this.log.error(`UncaughtException:: ${error.message || String(error)}`)
+      this.log.error(`UncaughtException: ${error.stack || error.message || String(error)}`)
       reportError(error)
     })
   }