diff --git a/src/parser/driver.cc b/src/parser/driver.cc
index 3b0a6950..3cae46e7 100644
--- a/src/parser/driver.cc
+++ b/src/parser/driver.cc
@@ -66,6 +66,7 @@ int Driver::addSecRule(Rule *rule) {
 
 
 int Driver::parse(const std::string &f, const std::string &ref) {
+    lastRule = NULL;
     loc.push_back(new yy::location());
     if (ref.empty()) {
         this->ref.push_back("<<reference missing or not informed>>");
diff --git a/src/rules.cc b/src/rules.cc
index e9654908..5d9d15e0 100644
--- a/src/rules.cc
+++ b/src/rules.cc
@@ -251,7 +251,9 @@ int Rules::merge(Rules *from) {
     this->debugLog->refCountIncrease();
 
     this->audit_log = from->audit_log;
-    this->audit_log->refCountIncrease();
+    if (this->audit_log != NULL) {
+        this->audit_log->refCountIncrease();
+    }
 
     this->debugLog->setDebugLevel(from->debugLevel);
     this->debugLog->setOutputFile(from->debug_log_path);