diff --git a/lib/reducers/term-groups.js b/lib/reducers/term-groups.js
index ad14152e..d5e44b65 100644
--- a/lib/reducers/term-groups.js
+++ b/lib/reducers/term-groups.js
@@ -152,7 +152,9 @@ const replaceParent = (state, parent, child) => {
 
 const removeGroup = (state, uid) => {
   const group = state.termGroups[uid];
-  if (group.parentUid) {
+  // when close tab with multiple panes, it remove group from parent to child. so maybe the parentUid exists but parent group have removed.
+  // it's safe to remove the group.
+  if (group.parentUid && state.termGroups[group.parentUid]) {
     const parent = state.termGroups[group.parentUid];
     const newChildren = parent.children.filter(childUid => childUid !== uid);
     if (newChildren.length === 1) {