diff --git a/src/hsm/cmd_extras.c b/src/hsm/cmd_extras.c
index eaea88e..5e1748a 100644
--- a/src/hsm/cmd_extras.c
+++ b/src/hsm/cmd_extras.c
@@ -36,6 +36,10 @@ int cmd_extras() {
         return SW_SECURITY_STATUS_NOT_SATISFIED();
     }
 #endif
+    //check button (if enabled)
+    if (wait_button_pressed() == true) { 
+        return SW_SECURE_MESSAGE_EXEC_ERROR();
+    }
     if (P1(apdu) == 0xA) { //datetime operations
         if (P2(apdu) != 0x0) {
             return SW_INCORRECT_P1P2();
diff --git a/src/hsm/cmd_list_keys.c b/src/hsm/cmd_list_keys.c
index a7c9fce..566fd93 100644
--- a/src/hsm/cmd_list_keys.c
+++ b/src/hsm/cmd_list_keys.c
@@ -60,5 +60,11 @@ int cmd_list_keys() {
             res_APDU[res_APDU_size++] = f->fid & 0xff;
         }
     }
+#if !defined(ENABLE_EMULATION)
+    if ((apdu.rlen + 2 + 10) % 64 == 0) { // FIX for strange behaviour with PSCS and multiple of 64
+        res_APDU[res_APDU_size++] = 0;
+        res_APDU[res_APDU_size++] = 0;
+    }
+#endif
     return SW_OK();
 }