diff --git a/lib/nfc/protocols/slix.c b/lib/nfc/protocols/slix.c
index e61c70919..6c6deacdd 100644
--- a/lib/nfc/protocols/slix.c
+++ b/lib/nfc/protocols/slix.c
@@ -217,6 +217,10 @@ bool slix_generic_protocol_filter(
             break;
         }
 
+        if(!password) {
+            break;
+        }
+
         for(int pos = 0; pos < 4; pos++) {
             password_rcv[pos] = password_xored[3 - pos] ^ rand[pos % 2];
         }