diff --git a/packages/ketcher-core/src/application/editor/actions/sgroup.ts b/packages/ketcher-core/src/application/editor/actions/sgroup.ts
index 0f1dee22a7..7ccb73516c 100644
--- a/packages/ketcher-core/src/application/editor/actions/sgroup.ts
+++ b/packages/ketcher-core/src/application/editor/actions/sgroup.ts
@@ -79,7 +79,10 @@ export function setExpandSGroup(restruct, sgid, attrs) {
   })
 
   const sgroup = restruct.molecule.sgroups.get(sgid)
-  if (sgroup.firstSgroupAtom) delete sgroup.firstSgroupAtom
+  if (sgroup.firstSgroupAtom) {
+    delete sgroup.firstSgroupAtom
+    delete sgroup.firstSgroupAtomId
+  }
   const atoms = SGroup.getAtoms(restruct, sgroup)
 
   atoms.forEach((aid) => {
diff --git a/packages/ketcher-core/src/application/render/restruct/resgroup.js b/packages/ketcher-core/src/application/render/restruct/resgroup.js
index f04b2fe2c9..16cf8fc2ee 100644
--- a/packages/ketcher-core/src/application/render/restruct/resgroup.js
+++ b/packages/ketcher-core/src/application/render/restruct/resgroup.js
@@ -56,6 +56,7 @@ class ReSGroup extends ReObject {
         if (FunctionalGroup.isAttachmentPointAtom(aid, remol.molecule)) {
           sgroup.firstSgroupAtom = remol.molecule.atoms.get(aid)
           sgroup.functionalGroup = true
+          sgroup.firstSgroupAtomId = aid
         }
       })
     } else {
@@ -139,10 +140,9 @@ class ReSGroup extends ReObject {
       sGroupItem.firstSgroupAtom
     if (sGroupHasFirstAtom) {
       const firstAtomPosition = sGroupItem.firstSgroupAtom.pp
-      const [firstAtomId] = sGroupItem.atoms
-      const reSGroupAtom = render.ctab.atoms.get(firstAtomId)
+      const reSGroupAtom = render.ctab.atoms.get(sGroupItem.firstSgroupAtomId)
       const sGroupTextBoundingBox =
-        reSGroupAtom.visel.boundingBox || reSGroupAtom.visel.oldBoundingBox
+        reSGroupAtom?.visel.boundingBox || reSGroupAtom?.visel.oldBoundingBox
       if (sGroupTextBoundingBox) {
         const { x, y } = Scale.obj2scaled(firstAtomPosition, render.options)
         const { p0, p1 } = sGroupTextBoundingBox
diff --git a/packages/ketcher-core/src/domain/entities/sgroup.ts b/packages/ketcher-core/src/domain/entities/sgroup.ts
index f591e7e988..826b84e3c7 100644
--- a/packages/ketcher-core/src/domain/entities/sgroup.ts
+++ b/packages/ketcher-core/src/domain/entities/sgroup.ts
@@ -81,6 +81,7 @@ export class SGroup {
   pp: Vec2 | null
   data: any
   firstSgroupAtom: any
+  firstSgroupAtomId: number
 
   constructor(type: string) {
     this.type = type
@@ -101,6 +102,7 @@ export class SGroup {
     this.xBonds = []
     this.neiAtoms = []
     this.pp = null
+    this.firstSgroupAtomId = -1
     this.data = {
       mul: 1, // multiplication count for MUL group
       connectivity: 'ht', // head-to-head, head-to-tail or either-unknown
diff --git a/packages/ketcher-react/src/script/ui/views/components/StructEditor/InfoPanel.tsx b/packages/ketcher-react/src/script/ui/views/components/StructEditor/InfoPanel.tsx
index 1dfa9cac52..9cb6728c1c 100644
--- a/packages/ketcher-react/src/script/ui/views/components/StructEditor/InfoPanel.tsx
+++ b/packages/ketcher-react/src/script/ui/views/components/StructEditor/InfoPanel.tsx
@@ -29,10 +29,9 @@ import classes from './InfoPanel.module.less'
 const HOVER_PANEL_PADDING = 20
 
 function getSGroupFirstAtom(sGroup: SGroup, render: Render): Vec2 {
-  const { firstSgroupAtom } = sGroup
+  const { firstSgroupAtom, firstSgroupAtomId } = sGroup
   if (firstSgroupAtom) return firstSgroupAtom.pp
-  const [firstAtomId] = sGroup.atoms
-  return render.ctab.atoms?.get(firstAtomId)?.a.pp || new Vec2(0, 0)
+  return render.ctab.atoms?.get(firstSgroupAtomId)?.a.pp || new Vec2(0, 0)
 }
 
 function getPanelPosition(