There is a small bug in Magento 2.0.4 if there is no meta description of a product, Magento by default takes the product description but does not strip it so that all the html tags are out. Find the file : vendor\\magento\\module-catalog\\Block\\Product\\View.php and the code below<\/p>\n
\n$currentCategory = $this->_coreRegistry->registry('current_category');\n137if ($keyword) {\n138 $this->pageConfig->setKeywords($keyword);\n139} elseif ($currentCategory) {\n140 $this->pageConfig->setKeywords($product->getName());\n141}\n142$description = $product->getMetaDescription();\n143if ($description) {\n144 $this->pageConfig->setDescription($description);\n145} else {\n146 $this->pageConfig->setDescription($this->string->substr($product->getDescription(), 0, 255));\n<\/span>147}\n148if ($this->_productHelper->canUseCanonicalTag()) {\n149 $this->pageConfig->addRemotePageAsset(\n150 $product->getUrlModel()->getUrl($product, ['_ignore_category' => true]),\n151 'canonical',\n152 ['attributes' => ['rel' => 'canonical']]\n153 );\n154}\n155\n\n156$pageMainTitle = $this->getLayout()->getBlock('page.main.title');\n\n<\/code><\/pre>\nChange the indicated line in blue to : $this->pageConfig->setDescription($this->string->substr(strip_tags($product->getDescription()), 0, 255));<\/p>\n","protected":false},"excerpt":{"rendered":"