diff --git a/src/main/java/org/edgegallery/mecm/apm/apihandler/filter/JsonRequestSizeLimitFilter.java b/src/main/java/org/edgegallery/mecm/apm/apihandler/filter/JsonRequestSizeLimitFilter.java
index 4746dbcbb8d15ffe87251ea5ca370def1198b765..a3f122f399d09a4a87a2e467cbdad7e5e26b6607 100644
--- a/src/main/java/org/edgegallery/mecm/apm/apihandler/filter/JsonRequestSizeLimitFilter.java
+++ b/src/main/java/org/edgegallery/mecm/apm/apihandler/filter/JsonRequestSizeLimitFilter.java
@@ -51,7 +51,10 @@ public class JsonRequestSizeLimitFilter extends OncePerRequestFilter {
     }
 
     private boolean isApplicationJson(HttpServletRequest httpRequest) {
-        return MediaType.APPLICATION_JSON.isCompatibleWith(MediaType
-                .parseMediaType(httpRequest.getHeader(HttpHeaders.CONTENT_TYPE)));
+        if (httpRequest.getHeader(HttpHeaders.CONTENT_TYPE) != null) {
+            return MediaType.APPLICATION_JSON.isCompatibleWith(MediaType
+                    .parseMediaType(httpRequest.getHeader(HttpHeaders.CONTENT_TYPE)));
+        }
+        return false;
     }
 }