diff --git a/Formatter/OutputFormatter.php b/Formatter/OutputFormatter.php
index ca5f28731..3813b542d 100644
--- a/Formatter/OutputFormatter.php
+++ b/Formatter/OutputFormatter.php
@@ -215,7 +215,11 @@ private function createStyleFromString($string)
             } elseif ('bg' == $match[0]) {
                 $style->setBackground($match[1]);
             } else {
-                $style->setOption($match[1]);
+                try {
+                    $style->setOption($match[1]);
+                } catch (\InvalidArgumentException $e) {
+                    return false;
+                }
             }
         }
 
diff --git a/Tests/Formatter/OutputFormatterTest.php b/Tests/Formatter/OutputFormatterTest.php
index c8f0b987a..bdaf36cae 100644
--- a/Tests/Formatter/OutputFormatterTest.php
+++ b/Tests/Formatter/OutputFormatterTest.php
@@ -151,7 +151,7 @@ public function testNonStyleTag()
     {
         $formatter = new OutputFormatter(true);
 
-        $this->assertEquals("\033[32msome \033[0m\033[32m<tag>\033[0m\033[32m styled \033[0m\033[32m<p>\033[0m\033[32msingle-char tag\033[0m\033[32m</p>\033[0m", $formatter->format('<info>some <tag> styled <p>single-char tag</p></info>'));
+        $this->assertEquals("\033[32msome \033[0m\033[32m<tag>\033[0m\033[32m \033[0m\033[32m<setting=value>\033[0m\033[32m styled \033[0m\033[32m<p>\033[0m\033[32msingle-char tag\033[0m\033[32m</p>\033[0m", $formatter->format('<info>some <tag> <setting=value> styled <p>single-char tag</p></info>'));
     }
 
     public function testFormatLongString()