diff --git a/laws-base/laws-base-core/src/main/java/com/jero/config/filter/cors/CorsFilter.java b/laws-base/laws-base-core/src/main/java/com/jero/config/filter/cors/CorsFilter.java
index 97f423f9..7c761391 100644
--- a/laws-base/laws-base-core/src/main/java/com/jero/config/filter/cors/CorsFilter.java
+++ b/laws-base/laws-base-core/src/main/java/com/jero/config/filter/cors/CorsFilter.java
@@ -64,7 +64,7 @@ public class CorsFilter implements Filter {
         String[] ieBrowserSignals = {"MSIE", "Trident"};
         String userAgent = request.getHeader("User-Agent");
         for (String signal : ieBrowserSignals) {
-            if (userAgent.contains(signal)){
+            if (userAgent != null && userAgent.contains(signal)){
                 return true;
             }
         }