diff --git a/src/Monolog/Formatter/NormalizerFormatter.php b/src/Monolog/Formatter/NormalizerFormatter.php
index 867f6fb7..8205d266 100644
--- a/src/Monolog/Formatter/NormalizerFormatter.php
+++ b/src/Monolog/Formatter/NormalizerFormatter.php
@@ -142,8 +142,8 @@ class NormalizerFormatter implements FormatterInterface
                 $data['faultactor'] = $e->faultactor;
             }
 
-            if (isset($e->detail)) {
-                $data['detail'] = $e->detail;
+            if (isset($e->detail) && (is_string($e->detail) || is_object($e->detail) || is_array($e->detail))) {
+                $data['detail'] = is_string($e->detail) ? $e->detail : reset($e->detail);
             }
         }
 
diff --git a/tests/Monolog/Formatter/NormalizerFormatterTest.php b/tests/Monolog/Formatter/NormalizerFormatterTest.php
index d4e0d98d..986daa62 100644
--- a/tests/Monolog/Formatter/NormalizerFormatterTest.php
+++ b/tests/Monolog/Formatter/NormalizerFormatterTest.php
@@ -92,7 +92,7 @@ class NormalizerFormatterTest extends \PHPUnit_Framework_TestCase
         }
 
         $formatter = new NormalizerFormatter('Y-m-d');
-        $e = new \SoapFault('foo', 'bar', 'hello', 'world');
+        $e = new \SoapFault('foo', 'bar', 'hello', (object) ['foo' => 'world']);
         $formatted = $formatter->format(array(
             'exception' => $e,
         ));