From ce1fec1c6a03c8071326fce6140296932619d1e4 Mon Sep 17 00:00:00 2001
From: Roman Rodionov <roman_rodionov@epam.com>
Date: Thu, 4 Jul 2024 16:40:56 +0200
Subject: [PATCH] #4924 - RNA Preset without Base causes constant crash after
 switching to Macromolecules mode

- added safety checks in rna presets getter
---
 .../ketcher-macromolecules/src/helpers/getPreset.ts  | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/packages/ketcher-macromolecules/src/helpers/getPreset.ts b/packages/ketcher-macromolecules/src/helpers/getPreset.ts
index 5c140250c6..63db150d13 100644
--- a/packages/ketcher-macromolecules/src/helpers/getPreset.ts
+++ b/packages/ketcher-macromolecules/src/helpers/getPreset.ts
@@ -53,10 +53,16 @@ export const getPresets = (
       ) as MonomerItemType;
 
       const result: IRnaPreset = {
-        base: { ...rnaBase, label: rnaBase.props.MonomerName },
+        base: rnaBase
+          ? { ...rnaBase, label: rnaBase.props.MonomerName }
+          : undefined,
         name: rnaPresetsTemplate.name,
-        phosphate: { ...phosphate, label: phosphate.props.MonomerName },
-        sugar: { ...ribose, label: ribose.props.MonomerName },
+        phosphate: phosphate
+          ? { ...phosphate, label: phosphate.props.MonomerName }
+          : undefined,
+        sugar: ribose
+          ? { ...ribose, label: ribose.props.MonomerName }
+          : undefined,
         favorite: rnaPresetsTemplate.favorite,
         default: isDefault || rnaPresetsTemplate.default,
       };