diff --git a/mbtk/libgsw_lib/gsw_nw_interface.c b/mbtk/libgsw_lib/gsw_nw_interface.c
index 42dd7f4..7824fe8 100755
--- a/mbtk/libgsw_lib/gsw_nw_interface.c
+++ b/mbtk/libgsw_lib/gsw_nw_interface.c
@@ -1378,15 +1378,15 @@
         if(ret != 0)
         {
             LOGE(GSW_NW,"mbtk_net_signal_get fail, ret is %d\n",ret);
-           
+            memset((void*) &sig_strength,0,sizeof (sig_strength));
         }
         else
         {
             convert_mbtk_sig_info_to_gsw_sig_info(&signal,&sig_strength);
-            if(sig_cb != NULL)
-            {
-                sig_cb(sig_strength);
-            }
+        }
+        if(sig_cb != NULL)
+        {
+            sig_cb(sig_strength);
         }
         sleep(SIG_TIMER);
     }