diff --git a/server/bundles/io.cloudbeaver.service.security/src/io/cloudbeaver/service/security/CBEmbeddedSecurityController.java b/server/bundles/io.cloudbeaver.service.security/src/io/cloudbeaver/service/security/CBEmbeddedSecurityController.java
index 81f1fd7e0c..629f26a39a 100644
--- a/server/bundles/io.cloudbeaver.service.security/src/io/cloudbeaver/service/security/CBEmbeddedSecurityController.java
+++ b/server/bundles/io.cloudbeaver.service.security/src/io/cloudbeaver/service/security/CBEmbeddedSecurityController.java
@@ -411,7 +411,14 @@ public class CBEmbeddedSecurityController<T extends ServletAuthApplication>
         @NotNull Connection dbCon,
         @NotNull String userId,
         @NotNull String[] teamIds
-    ) throws SQLException {
+    ) throws SQLException, DBCException {
+        String defaultTeam = getDefaultUserTeam();
+        if (ArrayUtils.contains(teamIds, defaultTeam)) {
+            throw new SMException("Cannot delete default user team: " + defaultTeam);
+        }
+        if (ArrayUtils.isEmpty(teamIds)) {
+            return;
+        }
         String deleteUserTeamsSql = "DELETE FROM {table_prefix}CB_USER_TEAM WHERE USER_ID=? " +
                 "AND TEAM_ID IN (" + SQLUtils.generateParamList(teamIds.length) + ")";