diff --git a/backend/.sqlx/query-5d1ec728380ea8baf64df54743e73008ee9a58e6f39a5bf31a2ed099727f5c04.json b/backend/.sqlx/query-5d1ec728380ea8baf64df54743e73008ee9a58e6f39a5bf31a2ed099727f5c04.json
new file mode 100644
index 0000000000..8a4fb840b1
--- /dev/null
+++ b/backend/.sqlx/query-5d1ec728380ea8baf64df54743e73008ee9a58e6f39a5bf31a2ed099727f5c04.json
@@ -0,0 +1,22 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "SELECT EXISTS(SELECT 1 FROM worker_ping WHERE custom_tags @> $1 AND ping_at > now() - interval '1 minute')",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "exists",
+        "type_info": "Bool"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "TextArray"
+      ]
+    },
+    "nullable": [
+      null
+    ]
+  },
+  "hash": "5d1ec728380ea8baf64df54743e73008ee9a58e6f39a5bf31a2ed099727f5c04"
+}
diff --git a/backend/windmill-api/openapi.yaml b/backend/windmill-api/openapi.yaml
index 33d9b4320a..fd7691745b 100644
--- a/backend/windmill-api/openapi.yaml
+++ b/backend/windmill-api/openapi.yaml
@@ -6028,6 +6028,26 @@ paths:
                 items:
                   $ref: "#/components/schemas/WorkerPing"
 
+  /workers/exists_worker_with_tag:
+    get:
+      summary: exists worker with tag
+      operationId: existsWorkerWithTag
+      tags:
+        - worker
+      parameters:
+        - name: tag
+          in: query
+          required: true
+          schema:
+            type: string
+      responses:
+        "200":
+          description: whether a worker with the tag exists
+          content:
+            application/json:
+              schema:
+                type: boolean
+
   /configs/list_worker_groups:
     get:
       summary: list worker groups
diff --git a/backend/windmill-api/src/workers.rs b/backend/windmill-api/src/workers.rs
index 4e6828e580..bbc7fa6e2a 100644
--- a/backend/windmill-api/src/workers.rs
+++ b/backend/windmill-api/src/workers.rs
@@ -26,6 +26,7 @@ use crate::db::ApiAuthed;
 pub fn global_service() -> Router {
     Router::new()
         .route("/list", get(list_worker_pings))
+        .route("/exists_worker_with_tag", get(exists_worker_with_tag))
         .route("/custom_tags", get(get_custom_tags))
 }
 
@@ -68,6 +69,27 @@ async fn list_worker_pings(
     Ok(Json(rows))
 }
 
+#[derive(Serialize, Deserialize)]
+struct TagQuery {
+    tag: String,
+}
+
+async fn exists_worker_with_tag(
+    authed: ApiAuthed,
+    Extension(user_db): Extension<UserDB>,
+    Query(tag_query): Query<TagQuery>,
+) -> JsonResult<bool> {
+    let mut tx = user_db.begin(&authed).await?;
+    let row = sqlx::query!(
+        "SELECT EXISTS(SELECT 1 FROM worker_ping WHERE custom_tags @> $1 AND ping_at > now() - interval '1 minute')",
+        &[tag_query.tag]
+    )
+    .fetch_one(&mut *tx)
+    .await?;
+    tx.commit().await?;
+    Ok(Json(row.exists.unwrap_or(false)))
+}
+
 async fn get_custom_tags() -> Json<Vec<String>> {
     Json(ALL_TAGS.read().await.clone().into())
 }
diff --git a/frontend/src/lib/components/JobStatus.svelte b/frontend/src/lib/components/JobStatus.svelte
index 241547cbd9..601e559afe 100644
--- a/frontend/src/lib/components/JobStatus.svelte
+++ b/frontend/src/lib/components/JobStatus.svelte
@@ -5,6 +5,7 @@
 	import { forLater } from '$lib/forLater'
 	import DurationMs from './DurationMs.svelte'
 	import { Calendar, CheckCircle2, Circle, Clock, XCircle } from 'lucide-svelte'
+	import NoWorkerWithTagWarning from './runs/NoWorkerWithTagWarning.svelte'
 
 	const SMALL_ICON_SIZE = 12
 
@@ -39,8 +40,9 @@
 		</Badge>
 	</div>
 {:else if job && 'running' in job}
-	<div>
+	<div class="flex flex-row gap-1 items-center">
 		<Badge icon={{ icon: Clock, position: 'left' }}>Queued</Badge>
+		<NoWorkerWithTagWarning tag={job.tag} />
 	</div>
 {:else}
 	<Circle size={SMALL_ICON_SIZE} class="text-gray-200" />
diff --git a/frontend/src/lib/components/LogViewer.svelte b/frontend/src/lib/components/LogViewer.svelte
index 0cc5345391..be5ee8d1c0 100644
--- a/frontend/src/lib/components/LogViewer.svelte
+++ b/frontend/src/lib/components/LogViewer.svelte
@@ -4,6 +4,7 @@
 	import { copyToClipboard } from '$lib/utils'
 	import { workspaceStore } from '$lib/stores'
 	import AnsiUp from 'ansi_up'
+	import NoWorkerWithTagWarning from './runs/NoWorkerWithTagWarning.svelte'
 
 	export let content: string | undefined
 	export let isLoading: boolean
@@ -89,10 +90,13 @@
 			</div>
 		</div>
 		{#if isLoading}
-			<div class="flex gap-2 absolute top-2 left-2 items-center">
+			<div class="flex gap-2 absolute top-2 left-2 items-center z-10">
 				<Loader2 class="animate-spin" />
 				{#if tag}
-					<div class="text-secondary {small ? '!text-2xs' : '!text-xs'}">tag: {tag}</div>
+					<div class="flex flex-row items-center gap-1">
+						<div class="text-secondary {small ? '!text-2xs' : '!text-xs'}">tag: {tag}</div>
+						<NoWorkerWithTagWarning {tag} />
+					</div>
 				{/if}
 			</div>
 		{:else if duration}
diff --git a/frontend/src/lib/components/Popover.svelte b/frontend/src/lib/components/Popover.svelte
index 237b468ab7..47404165d0 100644
--- a/frontend/src/lib/components/Popover.svelte
+++ b/frontend/src/lib/components/Popover.svelte
@@ -4,7 +4,7 @@
 	import Portal from 'svelte-portal'
 	import { ExternalLink } from 'lucide-svelte'
 
-	export let placement: PopoverPlacement = 'auto'
+	export let placement: PopoverPlacement = 'bottom-end'
 	export let notClickable = false
 	export let popupClass = ''
 	export let disablePopup = false
@@ -16,7 +16,7 @@
 	const [popperRef, popperContent] = createPopperActions({ placement })
 
 	const popperOptions: PopperOptions<{}> = {
-		placement: 'bottom-end',
+		placement,
 		strategy: 'fixed',
 		modifiers: [
 			{ name: 'offset', options: { offset: [8, 8] } },
diff --git a/frontend/src/lib/components/runs/NoWorkerWithTagWarning.svelte b/frontend/src/lib/components/runs/NoWorkerWithTagWarning.svelte
new file mode 100644
index 0000000000..a85d8e724f
--- /dev/null
+++ b/frontend/src/lib/components/runs/NoWorkerWithTagWarning.svelte
@@ -0,0 +1,40 @@
+<script lang="ts">
+	import { WorkerService } from '$lib/gen'
+	import { AlertTriangle } from 'lucide-svelte'
+	import Popover from '../Popover.svelte'
+	import { onDestroy } from 'svelte'
+	export let tag: string
+
+	let noWorkerWithTag = false
+
+	let timeout: NodeJS.Timeout | undefined = undefined
+
+	async function lookForTag(): Promise<void> {
+		try {
+			const existsWorkerWithTag = await WorkerService.existsWorkerWithTag({ tag })
+			noWorkerWithTag = !existsWorkerWithTag
+			timeout = setTimeout(() => {
+				lookForTag()
+			}, 1000)
+		} catch (err) {
+			console.error(err)
+		}
+	}
+
+	lookForTag()
+
+	onDestroy(() => {
+		if (timeout) {
+			clearTimeout(timeout)
+		}
+	})
+</script>
+
+{#if noWorkerWithTag}
+	<Popover notClickable placement="top">
+		<AlertTriangle size={16} class="text-yellow-500" />
+		<svelte:fragment slot="text">
+			No worker with tag <b>{tag}</b> is currently running.
+		</svelte:fragment>
+	</Popover>
+{/if}