1 files changed, 9 insertions, 0 deletions
diff --git a/py/runtime.c b/py/runtime.c
index e6d8c6807..2c3b3ddde 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -319,6 +319,15 @@ mp_obj_t mp_unary_op(mp_unary_op_t op, mp_obj_t arg) {
             // if arg==mp_const_none.
             return mp_const_true;
         }
+        #if MICROPY_PY_BUILTINS_FLOAT
+        if (op == MP_UNARY_OP_FLOAT_MAYBE
+            #if MICROPY_PY_BUILTINS_COMPLEX
+            || op == MP_UNARY_OP_COMPLEX_MAYBE
+            #endif
+            ) {
+            return MP_OBJ_NULL;
+        }
+        #endif
         // With MP_UNARY_OP_INT, mp_unary_op() becomes a fallback for mp_obj_get_int().
         // In this case provide a more focused error message to not confuse, e.g. chr(1.0)
         #if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE