diff --git a/server-spi-private/src/main/java/org/keycloak/policy/RegexPatternsPasswordPolicyProvider.java b/server-spi-private/src/main/java/org/keycloak/policy/RegexPatternsPasswordPolicyProvider.java
index cfcfbc538c..1a66020fbc 100644
--- a/server-spi-private/src/main/java/org/keycloak/policy/RegexPatternsPasswordPolicyProvider.java
+++ b/server-spi-private/src/main/java/org/keycloak/policy/RegexPatternsPasswordPolicyProvider.java
@@ -57,6 +57,8 @@ public class RegexPatternsPasswordPolicyProvider implements PasswordPolicyProvid
     public Object parseConfig(String value) {
         if (value == null) {
             throw new PasswordPolicyConfigException("Config required");
+        } else if(value.trim().isEmpty()) {
+            throw new PasswordPolicyConfigException("White space not acepted");
         }
         try {
             return Pattern.compile(value);