diff --git a/frontend/src/lib/components/SchemaEditor.svelte b/frontend/src/lib/components/SchemaEditor.svelte
index 15a3dd2ae6..6f0b989b58 100644
--- a/frontend/src/lib/components/SchemaEditor.svelte
+++ b/frontend/src/lib/components/SchemaEditor.svelte
@@ -15,6 +15,7 @@
 	import Portal from 'svelte-portal'
 
 	export let isFlowInput = false
+	export let blacklistedNames: string[] = []
 
 	const dispatch = createEventDispatcher()
 
@@ -374,5 +375,6 @@
 		on:save={(e) => handleAddOrEditArgument(e.detail)}
 		bind:editing
 		bind:oldArgName
+		{blacklistedNames}
 	/>
 </Portal>
diff --git a/frontend/src/lib/components/SchemaModal.svelte b/frontend/src/lib/components/SchemaModal.svelte
index 4ea92d734a..3be1c1d53a 100644
--- a/frontend/src/lib/components/SchemaModal.svelte
+++ b/frontend/src/lib/components/SchemaModal.svelte
@@ -73,6 +73,7 @@
 	export let editing = false
 	export let oldArgName: string | undefined = undefined
 	export let isFlowInput = false
+	export let blacklistedNames: string[] = []
 
 	const dispatch = createEventDispatcher()
 	let drawer: Drawer
@@ -80,12 +81,21 @@
 	let property: ModalSchemaProperty = DEFAULT_PROPERTY
 
 	function handleKeyUp(event: KeyboardEvent) {
+		validateName(property.name)
 		const key = event.key
 		if (key === 'Enter') {
 			dispatch('save', property)
 		}
 	}
 
+	function validateName(name: string) {
+		if (blacklistedNames.includes(name.toLowerCase())) {
+			error = 'This name is not allowed.'
+		} else {
+			error = ''
+		}
+	}
+
 	export function openDrawer(nproperty: ModalSchemaProperty): void {
 		drawer.openDrawer()
 		property = nproperty
diff --git a/frontend/src/lib/components/flows/content/FlowInput.svelte b/frontend/src/lib/components/flows/content/FlowInput.svelte
index 1cf00bb5cf..839e91af10 100644
--- a/frontend/src/lib/components/flows/content/FlowInput.svelte
+++ b/frontend/src/lib/components/flows/content/FlowInput.svelte
@@ -87,6 +87,7 @@
 				on:change={() => {
 					$flowStore = $flowStore
 				}}
+				blacklistedNames={['iter']}
 			/>
 		</div>
 	</div>