diff --git a/lib/log.js b/lib/log.js
index f0d3c97..fd11c36 100644
--- a/lib/log.js
+++ b/lib/log.js
@@ -51,6 +51,15 @@ class Logger {
   }
 
   _writeLogOutput(level, consoleArgs) {
+    const fields = consoleArgs[0];
+    if (typeof fields === 'object') {
+      if (fields && consoleArgs.length === 1 && fields.err && fields.err instanceof Error) {
+        consoleArgs = [fields.err.message];
+      } else {
+        consoleArgs.shift();
+      }
+    }
+
     if (this._debug) {
       const str = new Date().toISOString().substring(11, 23) + ' ';
 
diff --git a/test/index.js b/test/index.js
index 64eae0f..e682a10 100644
--- a/test/index.js
+++ b/test/index.js
@@ -310,6 +310,23 @@ describe('hexo-log', () => {
     consoleWarnSpy.calledOnce.should.be.false;
     consoleErrorSpy.calledTwice.should.be.false;
   });
+
+  it('should not display error as object', () => {
+    const consoleWarnSpy = sinon.spy();
+    const consoleErrorSpy = sinon.spy();
+
+    loggerModule.__set__('console.warn', consoleWarnSpy);
+    loggerModule.__set__('console.error', consoleErrorSpy);
+
+    loggerModule.__with__(fakeProcess)(() => {
+      const log = loggerModule();
+      log.warn({err: new Error('test')});
+      log.error({err: new Error('test')}, 'test: %s', 'test');
+    });
+
+    consoleWarnSpy.args[0][0].should.eql('test');
+    consoleErrorSpy.args[0][0].should.eql('test: %s');
+  });
 });
 
 describe('hexo-log example', () => {