diff --git a/lib/libesp32/berry/src/be_byteslib.c b/lib/libesp32/berry/src/be_byteslib.c
index 82f4ab2be..17a5a7d4c 100644
--- a/lib/libesp32/berry/src/be_byteslib.c
+++ b/lib/libesp32/berry/src/be_byteslib.c
@@ -650,6 +650,9 @@ buf_impl bytes_check_data(bvm *vm, size_t add_size) {
     buf_impl attr = m_read_attributes(vm, 1);
     /* check if the `size` is big enough */
     if (attr.len + (int32_t)add_size > attr.size) {
+        if (attr.fixed) {
+            be_raise(vm, BYTES_RESIZE_ERROR, BYTES_RESIZE_MESSAGE);
+        }
         /* it does not fit so we need to realocate the buffer */
         bytes_resize(vm, &attr, attr.len + add_size);
     }
diff --git a/lib/libesp32/berry/src/be_parser.c b/lib/libesp32/berry/src/be_parser.c
index d2f2d7af5..094a5adef 100644
--- a/lib/libesp32/berry/src/be_parser.c
+++ b/lib/libesp32/berry/src/be_parser.c
@@ -174,7 +174,7 @@ void end_varinfo(bparser *parser, int beginpc)
     if (beginpc == -1) /* use block->beginpc by default */
         beginpc = binfo->beginpc;
     /* skip the variable of the previous blocks */
-    for (; it->beginpc < beginpc; ++it);
+    for (; (it <= end) && (it->beginpc < beginpc); ++it);
     for (; it <= end; ++it) {
         if (!it->endpc) /* write to endpc only once */
             it->endpc = finfo->pc;