diff --git a/gnss/GnssAdapter.cpp b/gnss/GnssAdapter.cpp
index 8112a715..791f9d64 100644
--- a/gnss/GnssAdapter.cpp
+++ b/gnss/GnssAdapter.cpp
@@ -2000,8 +2000,10 @@ GnssAdapter::restartSessions()
     }
 
     // get the LocationOptions that has the smallest interval, which should be the active one
-    TrackingOptions smallestIntervalOptions = {}; // size is zero until set for the first time
-    TrackingOptions highestPowerTrackingOptions = {};
+    TrackingOptions smallestIntervalOptions; // size is zero until set for the first time
+    TrackingOptions highestPowerTrackingOptions;
+    memset(&smallestIntervalOptions, 0, sizeof(smallestIntervalOptions));
+    memset(&highestPowerTrackingOptions, 0, sizeof(highestPowerTrackingOptions));
     for (auto it = mTrackingSessions.begin(); it != mTrackingSessions.end(); ++it) {
         // size of zero means we havent set it yet
         if (0 == smallestIntervalOptions.size ||
@@ -3023,8 +3025,8 @@ GnssAdapter::reportPosition(const UlpLocation& ulpLocation,
         loc_nmea_generate_pos(ulpLocation, locationExtended, mLocSystemInfo,
                               generate_nmea, nmeaArraystr);
         stringstream ss;
-        for (auto sentence : nmeaArraystr) {
-            ss << sentence;
+        for (auto itor = nmeaArraystr.begin(); itor != nmeaArraystr.end(); ++itor) {
+            ss << *itor;
         }
         string s = ss.str();
         reportNmea(s.c_str(), s.length());
@@ -3119,8 +3121,8 @@ GnssAdapter::reportSv(GnssSvNotification& svNotify)
         std::vector<std::string> nmeaArraystr;
         loc_nmea_generate_sv(svNotify, nmeaArraystr);
         stringstream ss;
-        for (auto sentence : nmeaArraystr) {
-            ss << sentence;
+        for (auto itor = nmeaArraystr.begin(); itor != nmeaArraystr.end(); ++itor) {
+            ss << *itor;
         }
         string s = ss.str();
         reportNmea(s.c_str(), s.length());
diff --git a/gnss/XtraSystemStatusObserver.cpp b/gnss/XtraSystemStatusObserver.cpp
index 6df54800..d84ae424 100644
--- a/gnss/XtraSystemStatusObserver.cpp
+++ b/gnss/XtraSystemStatusObserver.cpp
@@ -219,8 +219,11 @@ void XtraSystemStatusObserver::notify(const list<IDataItemCore*>& dlist)
         }
 
         inline ~HandleOsObserverUpdateMsg() {
-            for (auto each : mDataItemList) {
-                delete each;
+            for (auto itor = mDataItemList.begin(); itor != mDataItemList.end(); ++itor) {
+                if (*itor != nullptr) {
+                    delete *itor;
+                    *itor = nullptr;
+                }
             }
         }
 
diff --git a/utils/LocIpc.h b/utils/LocIpc.h
index a1a994d1..62309e78 100644
--- a/utils/LocIpc.h
+++ b/utils/LocIpc.h
@@ -106,7 +106,7 @@ public:
     // This class hides generated fd and destination address object from user.
     inline LocIpcSender(const char* destSocket):
             LocIpcSender(std::make_shared<int>(::socket(AF_UNIX, SOCK_DGRAM, 0)), destSocket) {
-        if (-1 == *mSocket) {
+        if (mSocket != nullptr && -1 == *mSocket) {
             mSocket = nullptr;
         }
     }