diff --git a/smtweb-framework/core/src/main/java/cc/smtweb/framework/core/session/SessionUtil.java b/smtweb-framework/core/src/main/java/cc/smtweb/framework/core/session/SessionUtil.java
index 91b02d2..13f5340 100644
--- a/smtweb-framework/core/src/main/java/cc/smtweb/framework/core/session/SessionUtil.java
+++ b/smtweb-framework/core/src/main/java/cc/smtweb/framework/core/session/SessionUtil.java
@@ -191,7 +191,8 @@ public class SessionUtil {
 
             AtomicInteger ai = cache.get(fpKey + "_" + fpk);
             if (ai == null) {
-                cache.put(fpKey + "_" + fpk, new AtomicInteger(0));
+                ai = new AtomicInteger(0);
+                cache.put(fpKey + "_" + fpk, ai);
             }
             r.put(KEY_PARAM_FP_KEY, fpk);
             r.put(KEY_PARAM_FP_VAL, ai.getAndIncrement());