diff --git a/x-ui-latest.sh b/x-ui-latest.sh
index 21c0994..41bbe8a 100644
--- a/x-ui-latest.sh
+++ b/x-ui-latest.sh
@@ -197,6 +197,11 @@ validate_domains() {
     RealitySubDomain=$(echo "$reality_domain" | sed 's/^[^ ]* \|\..*//g')
     RealityMainDomain=$(echo "$reality_domain" | sed 's/.*\.\([^.]*\..*\)$/\1/')
     [[ "${RealitySubDomain}.${RealityMainDomain}" != "${reality_domain}" ]] && RealityMainDomain=${reality_domain}
+
+    if [[ "$domain" == "$reality_domain" ]]; then
+        msg_err "Panel domain and REALITY domain must be different! Got: ${domain}"
+        exit 1
+    fi
 }
 
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