diff --git a/src/entry/Maat_hierarchy.cpp b/src/entry/Maat_hierarchy.cpp
index 7e629e6..7cb33cc 100644
--- a/src/entry/Maat_hierarchy.cpp
+++ b/src/entry/Maat_hierarchy.cpp
@@ -1119,11 +1119,14 @@ void Maat_hierarchy_compile_mid_udpate(struct Maat_hierarchy_compile_mid* mid, i
 				}
 				else
 				{
-					if(utarray_len(mid->_all_hit_clause_array)<MAX_GROUP_CACHE)
-					{
-						utarray_push_back(mid->_all_hit_clause_array, &clause_id);
-						utarray_sort(mid->_all_hit_clause_array, compare_clause_id);
+					if(utarray_len(mid->_all_hit_clause_array)> MAX_GROUP_CACHE)
+					{					
+						pthread_rwlock_unlock(&hier->rwlock);
+						return;
 					}
+					utarray_push_back(mid->_all_hit_clause_array, &clause_id);
+					utarray_sort(mid->_all_hit_clause_array, compare_clause_id);
+
 				}
 			}
 		}