diff --git a/system/nxrecorder/nxrecorder_main.c b/system/nxrecorder/nxrecorder_main.c
index 8ba3ad4b494..a8a4c63d67c 100644
--- a/system/nxrecorder/nxrecorder_main.c
+++ b/system/nxrecorder/nxrecorder_main.c
@@ -588,7 +588,7 @@ int main(int argc, FAR char *argv[])
 
               /* Remove leading spaces from arg */
 
-              while (*arg == ' ')
+              while (arg && *arg == ' ')
                 {
                   arg++;
                 }