diff --git a/lib/logger.js b/lib/logger.js
index 9db59e5..d4a14db 100644
--- a/lib/logger.js
+++ b/lib/logger.js
@@ -84,7 +84,7 @@ module.exports = function (levels, getLevelForCategory, setLevelForCategory) {
     }
 
     _log(level, data) {
-      debug(`sending log data (${level}, ${data}) to appenders`);
+      debug(`sending log data (${level}) to appenders`);
       const loggingEvent = new LoggingEvent(this.category, level, data, this.context);
       this.dispatch(loggingEvent);
     }
diff --git a/test/tap/logger-test.js b/test/tap/logger-test.js
index 4c706c6..c4ff6ed 100644
--- a/test/tap/logger-test.js
+++ b/test/tap/logger-test.js
@@ -120,5 +120,14 @@ test('../../lib/logger', (batch) => {
     t.end();
   });
 
+  batch.test('should not break when log data has no toString', (t) => {
+    const logger = new Logger(dispatch, 'thing');
+    logger.info('Just testing ', Object.create(null));
+
+    const events = testDispatcher.events;
+    t.equal(events.length, 1);
+    t.end();
+  });
+
   batch.end();
 });