diff --git a/servers/visual_server.cpp b/servers/visual_server.cpp
index ccbd27d8796..8b220d07b89 100644
--- a/servers/visual_server.cpp
+++ b/servers/visual_server.cpp
@@ -848,6 +848,7 @@ Error VisualServer::_surface_set_data(Array p_arrays, uint32_t p_format, uint32_
 }
 
 uint32_t VisualServer::mesh_surface_get_format_offset(uint32_t p_format, int p_vertex_len, int p_index_len, int p_array_index) const {
+	ERR_FAIL_INDEX_V(p_array_index, ARRAY_MAX, 0);
 	uint32_t offsets[ARRAY_MAX];
 	uint32_t strides[ARRAY_MAX];
 	mesh_surface_make_offsets_from_format(p_format, p_vertex_len, p_index_len, offsets, strides);
@@ -855,6 +856,7 @@ uint32_t VisualServer::mesh_surface_get_format_offset(uint32_t p_format, int p_v
 }
 
 uint32_t VisualServer::mesh_surface_get_format_stride(uint32_t p_format, int p_vertex_len, int p_index_len, int p_array_index) const {
+	ERR_FAIL_INDEX_V(p_array_index, ARRAY_MAX, 0);
 	uint32_t offsets[ARRAY_MAX];
 	uint32_t strides[ARRAY_MAX];
 	mesh_surface_make_offsets_from_format(p_format, p_vertex_len, p_index_len, offsets, strides);