diff --git a/src/entry/Maat_rule.cpp b/src/entry/Maat_rule.cpp
index 4e3477d..146fe14 100644
--- a/src/entry/Maat_rule.cpp
+++ b/src/entry/Maat_rule.cpp
@@ -1002,7 +1002,7 @@ void _destroy_compile_rule(struct _Maat_compile_inner_t * compile_rule)
 		free(db_compile_rule);
 		compile_rule->db_c_rule=NULL;
 	}
-	for(i=0; i<table->ex_data_num; i++)
+	for(i=0; table!=NULL && i<table->ex_data_num; i++)
 	{
 		rule_ex_data_free(&(db_compile_rule->m_rule_head), db_compile_rule->service_defined, compile_rule->ads+i, table->ex_desc+i);
 		compile_rule->ads[i]=NULL;
diff --git a/src/inc_internal/Maat_rule_internal.h b/src/inc_internal/Maat_rule_internal.h
index b2afb63..b94273d 100644
--- a/src/inc_internal/Maat_rule_internal.h
+++ b/src/inc_internal/Maat_rule_internal.h
@@ -46,7 +46,7 @@ typedef int atomic_t;
 #define	MAX_PLUGIN_PER_TABLE		32
 #define	MAX_FOREIGN_CLMN_NUM		8
 #define	MAX_SCANNER_HIT_NUM			64
-#define	MAX_COMPILE_EX_DATA_NUM		8
+#define	MAX_COMPILE_EX_DATA_NUM		2
 #define	MAX_GROUP_CACHE		128
 
 #define	MAX_FAILED_NUM		128