diff --git a/gps/libloc_api_50001/loc.cpp b/gps/libloc_api_50001/loc.cpp
index 9e08677..f27eadd 100644
--- a/gps/libloc_api_50001/loc.cpp
+++ b/gps/libloc_api_50001/loc.cpp
@@ -521,7 +521,7 @@ const GpsGeofencingInterface* get_geofence_interface(void)
     }
     dlerror();    /* Clear any existing error */
     get_gps_geofence_interface = (get_gps_geofence_interface_function)dlsym(handle, "gps_geofence_get_interface");
-    if ((error = dlerror()) != NULL)  {
+    if ((error = dlerror()) != NULL && NULL != get_gps_geofence_interface)  {
         LOC_LOGE ("%s, dlsym for get_gps_geofence_interface failed, error = %s\n", __func__, error);
         goto exit;
      }
diff --git a/gps/libloc_api_50001/loc_eng_nmea.cpp b/gps/libloc_api_50001/loc_eng_nmea.cpp
index 842eda1..4c6b9a3 100644
--- a/gps/libloc_api_50001/loc_eng_nmea.cpp
+++ b/gps/libloc_api_50001/loc_eng_nmea.cpp
@@ -119,14 +119,17 @@ void loc_eng_nmea_generate_pos(loc_eng_data_s_type *loc_eng_data_p,
                                unsigned char generate_nmea)
 {
     ENTRY_LOG();
+    time_t utcTime(location.gpsLocation.timestamp/1000);
+    tm * pTm = gmtime(&utcTime);
+    if (NULL == pTm) {
+        LOC_LOGE("gmtime failed");
+        return;
+    }
 
     char sentence[NMEA_SENTENCE_MAX_LENGTH] = {0};
     char* pMarker = sentence;
     int lengthRemaining = sizeof(sentence);
     int length = 0;
-
-    time_t utcTime(location.gpsLocation.timestamp/1000);
-    tm * pTm = gmtime(&utcTime);
     int utcYear = pTm->tm_year % 100; // 2 digit year
     int utcMonth = pTm->tm_mon + 1; // tm_mon starts at zero
     int utcDay = pTm->tm_mday;