diff --git a/src/group-configurations/data/slice.js b/src/group-configurations/data/slice.js
index 2014882543..4530de1943 100644
--- a/src/group-configurations/data/slice.js
+++ b/src/group-configurations/data/slice.js
@@ -28,8 +28,10 @@ const slice = createSlice({
       const parentGroupIndex = state.groupConfigurations.allGroupConfigurations.findIndex(
         group => parentGroupId === group.id,
       );
-      state.groupConfigurations.allGroupConfigurations[parentGroupIndex].groups = state
-        .groupConfigurations.allGroupConfigurations[parentGroupIndex].groups.filter(group => group.id !== groupId);
+      if (parentGroupIndex !== -1) {
+        state.groupConfigurations.allGroupConfigurations[parentGroupIndex].groups = state
+          .groupConfigurations.allGroupConfigurations[parentGroupIndex].groups.filter(group => group.id !== groupId);
+      }
     },
     updateLoadingStatus: (state, { payload }) => {
       state.loadingStatus = payload.status;
diff --git a/src/group-configurations/data/slice.test.js b/src/group-configurations/data/slice.test.js
new file mode 100644
index 0000000000..ebc6ef8780
--- /dev/null
+++ b/src/group-configurations/data/slice.test.js
@@ -0,0 +1,78 @@
+import {
+  reducer,
+  fetchGroupConfigurations,
+  updateGroupConfigurationsSuccess,
+  deleteGroupConfigurationsSuccess,
+  updateExperimentConfigurationSuccess,
+  deleteExperimentConfigurationSuccess,
+} from './slice';
+import { RequestStatus } from '../../data/constants';
+
+describe('groupConfigurations slice', () => {
+  let initialState;
+
+  beforeEach(() => {
+    initialState = {
+      savingStatus: '',
+      loadingStatus: RequestStatus.IN_PROGRESS,
+      groupConfigurations: {
+        allGroupConfigurations: [{ id: 1, name: 'Group 1', groups: [{ id: 1, name: 'inner group' }] }],
+        experimentGroupConfigurations: [],
+      },
+    };
+  });
+
+  it('should update group configurations with fetchGroupConfigurations', () => {
+    const payload = {
+      groupConfigurations: {
+        allGroupConfigurations: [{ id: 2, name: 'Group 2' }],
+        experimentGroupConfigurations: [],
+      },
+    };
+
+    const newState = reducer(initialState, fetchGroupConfigurations(payload));
+
+    expect(newState.groupConfigurations).toEqual(payload.groupConfigurations);
+  });
+
+  it('should update an existing group configuration with updateGroupConfigurationsSuccess', () => {
+    const payload = { data: { id: 1, name: 'Updated Group' } };
+
+    const newState = reducer(initialState, updateGroupConfigurationsSuccess(payload));
+
+    expect(newState.groupConfigurations.allGroupConfigurations[0]).toEqual(payload.data);
+  });
+
+  it('should delete a group configuration with deleteGroupConfigurationsSuccess', () => {
+    const payload = { parentGroupId: 1, groupId: 1 };
+
+    const newState = reducer(initialState, deleteGroupConfigurationsSuccess(payload));
+
+    expect(newState.groupConfigurations.allGroupConfigurations[0].groups.length).toEqual(0);
+  });
+
+  it('should update experiment configuration with updateExperimentConfigurationSuccess', () => {
+    const payload = { configuration: { id: 1, name: 'Experiment Config' } };
+
+    const newState = reducer(initialState, updateExperimentConfigurationSuccess(payload));
+
+    expect(newState.groupConfigurations.experimentGroupConfigurations.length).toEqual(1);
+    expect(newState.groupConfigurations.experimentGroupConfigurations[0]).toEqual(payload.configuration);
+  });
+
+  it('should delete an experiment configuration with deleteExperimentConfigurationSuccess', () => {
+    const initialStateWithExperiment = {
+      savingStatus: '',
+      loadingStatus: RequestStatus.IN_PROGRESS,
+      groupConfigurations: {
+        allGroupConfigurations: [],
+        experimentGroupConfigurations: [{ id: 1, name: 'Experiment Config' }],
+      },
+    };
+    const payload = { configurationId: 1 };
+
+    const newState = reducer(initialStateWithExperiment, deleteExperimentConfigurationSuccess(payload));
+
+    expect(newState.groupConfigurations.experimentGroupConfigurations.length).toEqual(0);
+  });
+});