diff --git a/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java b/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
index dc30cc1d5eab38..aa53e478246613 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
@@ -3214,8 +3214,11 @@ public void initFuzzyModeVariables() {
         }
         this.runtimeFilterWaitInfinitely = random.nextBoolean();
 
-        // set random 1, 10, 100, 1000, 10000
-        this.topnOptLimitThreshold = (int) Math.pow(10, random.nextInt(5));
+        // set random 101, 100, 1000, 10000, should be greater than 100, because small limit may lead
+        // some test case failed, e.g. topN with limit 100 may not hit the LimitAggToTopNAgg rule
+        // optimization when fuzzy
+        int randomLimitThreshold = (int) Math.pow(10, random.nextInt(5));
+        this.topnOptLimitThreshold = randomLimitThreshold <= 100 ? 101 : randomLimitThreshold;
 
         // for spill to disk
         if (Config.fuzzy_test_type.equals("p0")) {
diff --git a/regression-test/suites/nereids_rules_p0/mv/agg_optimize_when_uniform/agg_optimize_when_uniform.groovy b/regression-test/suites/nereids_rules_p0/mv/agg_optimize_when_uniform/agg_optimize_when_uniform.groovy
index 462ddbeb04d9d5..4fe8242eebbc3b 100644
--- a/regression-test/suites/nereids_rules_p0/mv/agg_optimize_when_uniform/agg_optimize_when_uniform.groovy
+++ b/regression-test/suites/nereids_rules_p0/mv/agg_optimize_when_uniform/agg_optimize_when_uniform.groovy
@@ -379,6 +379,10 @@ suite("agg_optimize_when_uniform") {
     def plan_6 = sql """explain verbose ${query6_0}"""
     logger.info("plan_6 is " + plan_6)
 
+    // This line of code is modified to position the occasional error: "null value is not in not null slot".
+    def query_mv6 = sql """select sum(__bin_4 is null) from mv6_0"""
+    logger.info("query_mv6 is " + query_mv6)
+
     order_qt_query6_0_after "${query6_0}"
     sql """ DROP MATERIALIZED VIEW IF EXISTS mv6_0"""