diff --git a/administrator/language/en-GB/en-GB.lib_joomla.ini b/administrator/language/en-GB/en-GB.lib_joomla.ini
index 5301ad0994980..26c9fa6a27fd0 100644
--- a/administrator/language/en-GB/en-GB.lib_joomla.ini
+++ b/administrator/language/en-GB/en-GB.lib_joomla.ini
@@ -143,6 +143,7 @@ JLIB_DATABASE_ERROR_ADAPTER_MYSQLI="The MySQL adapter 'mysqli' is not available.
 JLIB_DATABASE_ERROR_BIND_FAILED_INVALID_SOURCE_ARGUMENT="%s: :bind failed. Invalid source argument."
 JLIB_DATABASE_ERROR_ARTICLE_UNIQUE_ALIAS="Another article from this category has the same alias (remember it may be a trashed item)."
 JLIB_DATABASE_ERROR_CATEGORY_UNIQUE_ALIAS="Another category with the same parent category has the same alias (remember it may be a trashed item)."
+JLIB_DATABASE_ERROR_ALIAS_STARTS_WITH_A_NUMBER="The alias needs to start with a letter, but it starts with a digit."
 JLIB_DATABASE_ERROR_CHECK_FAILED="%s: :check Failed - %s"
 JLIB_DATABASE_ERROR_CHECKIN_FAILED="%s: :check-in failed - %s"
 JLIB_DATABASE_ERROR_CHECKOUT_FAILED="%s: :check-out failed - %s"
diff --git a/libraries/legacy/table/category.php b/libraries/legacy/table/category.php
index dfb761ef886d1..ffa8b891cb2e0 100644
--- a/libraries/legacy/table/category.php
+++ b/libraries/legacy/table/category.php
@@ -152,7 +152,7 @@ public function check()
 
 		if (trim(str_replace('-', '', $this->alias)) == '')
 		{
-			$this->alias = JFactory::getDate()->format('Y-m-d-H-i-s');
+			$this->alias = 'a' . JFactory::getDate()->format('Y-m-d-H-i-s');
 		}
 
 		return true;
@@ -235,6 +235,14 @@ public function store($updateNulls = false)
 			return false;
 		}
 
+		// Verify if the alias starts with a number
+		if (preg_match('/^\d/', $this->alias) === 1 && $this->modified_time === $this->created_time)
+		{
+			$this->setError(JText::_('JLIB_DATABASE_ERROR_ALIAS_STARTS_WITH_A_NUMBER'));
+
+			return false;
+		}
+
 		return parent::store($updateNulls);
 	}
 }