diff --git a/src/views/Charts/components/InstanceActivity.vue b/src/views/Charts/components/InstanceActivity.vue
index 3cea6ceb..d44d2831 100644
--- a/src/views/Charts/components/InstanceActivity.vue
+++ b/src/views/Charts/components/InstanceActivity.vue
@@ -258,9 +258,9 @@
             resizeObserver.value.disconnect();
             resizeObserver.value = null;
         }
-        if (echartsInstance.value) {
-            echartsInstance.value.dispose();
-            echartsInstance.value = null;
+        if (echartsInstance) {
+            echartsInstance.dispose();
+            echartsInstance = null;
         }
     });
 
diff --git a/src/views/Charts/composables/useMutualGraphChart.js b/src/views/Charts/composables/useMutualGraphChart.js
index 82233021..06b5e4d1 100644
--- a/src/views/Charts/composables/useMutualGraphChart.js
+++ b/src/views/Charts/composables/useMutualGraphChart.js
@@ -51,7 +51,7 @@ function computeForceOptions(nodes, links) {
         repulsion,
         edgeLength: [minEdge, maxEdge],
         gravity: 0.3,
-        layoutAnimation: false
+        layoutAnimation: nodes.length < 1000
     };
 }
 
diff --git a/src/views/Sidebar/components/GroupsSidebar.vue b/src/views/Sidebar/components/GroupsSidebar.vue
index 8f7b8082..10381079 100644
--- a/src/views/Sidebar/components/GroupsSidebar.vue
+++ b/src/views/Sidebar/components/GroupsSidebar.vue
@@ -6,7 +6,7 @@
                     <el-icon
                         class="rotation-transition"
                         :class="{
-                            'is-rotated': !groupInstancesCfg[getGroupId(group)].isCollapsed
+                            'is-rotated': !groupInstancesCfg[getGroupId(group)]?.isCollapsed
                         }"
                         ><ArrowRight
                     /></el-icon>
@@ -14,7 +14,7 @@
                 </div>
             </div>
 
-            <template v-if="!groupInstancesCfg[getGroupId(group)].isCollapsed">
+            <template v-if="!groupInstancesCfg[getGroupId(group)]?.isCollapsed">
                 <div
                     v-for="ref in group"
                     :key="ref.instance.id"