diff --git a/website/client/src/components/challenges/leaveChallengeModal.vue b/website/client/src/components/challenges/leaveChallengeModal.vue
index 5d6f878bb3..87386512e1 100644
--- a/website/client/src/components/challenges/leaveChallengeModal.vue
+++ b/website/client/src/components/challenges/leaveChallengeModal.vue
@@ -50,7 +50,21 @@ export default {
         challengeId: this.challengeId,
         keep,
       });
-      await this.$store.dispatch('tasks:fetchUserTasks', { forceLoad: true });
+      const userTasksByType = (await this.$store.dispatch('tasks:fetchUserTasks', { forceLoad: true })).data;
+      let tagInUse = false;
+      Object.keys(userTasksByType).forEach(taskType => {
+        userTasksByType[taskType].forEach(task => {
+          if (task.tags.indexOf(this.challengeId) > -1) {
+            tagInUse = true;
+          }
+        });
+      });
+      if (!tagInUse) {
+        await this.$store.dispatch(
+          'tags:deleteTag',
+          { tagId: this.challengeId },
+        );
+      }
       this.close();
     },
     close () {
diff --git a/website/client/src/store/actions/tags.js b/website/client/src/store/actions/tags.js
index 4ec43c5a3c..ef7937ad1f 100644
--- a/website/client/src/store/actions/tags.js
+++ b/website/client/src/store/actions/tags.js
@@ -1,13 +1,13 @@
 import axios from 'axios';
 
 export async function getTags () {
-  const url = 'api/v4/tags';
+  const url = '/api/v4/tags';
   const response = await axios.get(url);
   return response.data.data;
 }
 
 export async function createTag (store, payload) {
-  const url = 'api/v4/tags';
+  const url = '/api/v4/tags';
   const response = await axios.post(url, {
     name: payload.name,
   });
@@ -19,13 +19,13 @@ export async function createTag (store, payload) {
 }
 
 export async function getTag (store, payload) {
-  const url = `api/v4/tags/${payload.tagId}`;
+  const url = `/api/v4/tags/${payload.tagId}`;
   const response = await axios.get(url);
   return response.data.data;
 }
 
 export async function updateTag (store, payload) {
-  const url = `api/v4/tags/${payload.tagId}`;
+  const url = `/api/v4/tags/${payload.tagId}`;
   const response = await axios.put(url, {
     tagDetails: payload.tagDetails,
   });
@@ -33,7 +33,7 @@ export async function updateTag (store, payload) {
 }
 
 export async function sortTag (store, payload) {
-  const url = 'api/v4/reorder-tags';
+  const url = '/api/v4/reorder-tags';
   const response = await axios.post(url, {
     tagId: payload.tagId,
     to: payload.to,
@@ -42,7 +42,7 @@ export async function sortTag (store, payload) {
 }
 
 export async function deleteTag (store, payload) {
-  const url = `api/v4/tags/${payload.tagId}`;
+  const url = `/api/v4/tags/${payload.tagId}`;
   const response = await axios.delete(url);
   return response.data.data;
 }