diff --git a/dao/src/main/java/org/thingsboard/server/dao/rule/BaseRuleChainService.java b/dao/src/main/java/org/thingsboard/server/dao/rule/BaseRuleChainService.java
index 793adf7ac1..8e1af4a531 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/rule/BaseRuleChainService.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/rule/BaseRuleChainService.java
@@ -119,7 +119,7 @@ public class BaseRuleChainService extends AbstractEntityService implements RuleC
     public RuleChain saveRuleChain(RuleChain ruleChain, boolean publishSaveEvent) {
         ruleChainValidator.validate(ruleChain, RuleChain::getTenantId);
         try {
-            RuleChain savedRuleChain = ruleChainDao.save(ruleChain.getTenantId(), ruleChain);
+            RuleChain savedRuleChain = ruleChainDao.saveAndFlush(ruleChain.getTenantId(), ruleChain);
             if (ruleChain.getId() == null) {
                 entityCountService.publishCountEntityEvictEvent(ruleChain.getTenantId(), EntityType.RULE_CHAIN);
             }
diff --git a/dao/src/test/java/org/thingsboard/server/dao/service/RuleChainServiceTest.java b/dao/src/test/java/org/thingsboard/server/dao/service/RuleChainServiceTest.java
index 50f46020d8..86b76bd5a5 100644
--- a/dao/src/test/java/org/thingsboard/server/dao/service/RuleChainServiceTest.java
+++ b/dao/src/test/java/org/thingsboard/server/dao/service/RuleChainServiceTest.java
@@ -40,8 +40,11 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.UUID;
 import java.util.function.Function;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
 /**
  * Created by igor on 3/13/18.
  */
@@ -560,4 +563,35 @@ public class RuleChainServiceTest extends AbstractServiceTest {
         Assert.assertFalse(pageData.hasNext());
         Assert.assertEquals(0, pageData.getData().size());
     }
+
+    @Test
+    public void testSaveRuleChainWithExistingExternalId() {
+        RuleChainId externalRuleChainId = new RuleChainId(UUID.fromString("2675d180-e1e5-11ee-9f06-71b6c7dc2cbf"));
+
+        RuleChain ruleChain = getRuleChain();
+        ruleChain.setTenantId(tenantId);
+        ruleChain.setExternalId(externalRuleChainId);
+        ruleChainService.saveRuleChain(ruleChain);
+
+        assertThatThrownBy(() -> ruleChainService.saveRuleChain(ruleChain))
+                .isInstanceOf(DataValidationException.class)
+                .hasMessage("Rule Chain with such external id already exists!");
+
+        ruleChainService.deleteRuleChainsByTenantId(tenantId);
+    }
+
+    private RuleChain getRuleChain() {
+        String ruleChainStr = "{\n" +
+                "  \"name\": \"Root Rule Chain\",\n" +
+                "  \"type\": \"CORE\",\n" +
+                "  \"firstRuleNodeId\": {\n" +
+                "    \"entityType\": \"RULE_NODE\",\n" +
+                "    \"id\": \"91ad0b00-e779-11ee-9cf0-15d8b6079fdb\"\n" +
+                "  },\n" +
+                "  \"debugMode\": false,\n" +
+                "  \"configuration\": null,\n" +
+                "  \"additionalInfo\": null\n" +
+                "}";
+        return JacksonUtil.fromString(ruleChainStr, RuleChain.class);
+    }
 }