diff --git a/php/src/Data/ConfigurationManager.php b/php/src/Data/ConfigurationManager.php
index 07eb7078..6d4619ad 100644
--- a/php/src/Data/ConfigurationManager.php
+++ b/php/src/Data/ConfigurationManager.php
@@ -234,6 +234,11 @@ class ConfigurationManager
      * @throws InvalidSettingConfigurationException
      */
     public function SetDomain(string $domain) : void {
+        // Validate that at least one dot is contained
+        if (strpos($domain, '.') === false) {
+            throw new InvalidSettingConfigurationException("Domain must contain at least one dot!");
+        }
+
         // Validate domain
         if (!filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME)) {
             throw new InvalidSettingConfigurationException("Domain is not a valid domain!");