diff --git a/client/web/src/components/widgets/options/ToolOptions.vue b/client/web/src/components/widgets/options/ToolOptions.vue
index 7bfd0b0cad..fc68687002 100644
--- a/client/web/src/components/widgets/options/ToolOptions.vue
+++ b/client/web/src/components/widgets/options/ToolOptions.vue
@@ -56,6 +56,7 @@ interface NumberOption {
 	kind: "number";
 	initial: number;
 	step: number;
+	min?: number;
 	callback?: Function;
 }
 
@@ -116,7 +117,7 @@ export default defineComponent({
 					],
 				],
 				["Shape", [{ kind: "number", initial: 6, step: 1, min: 3, callback: this.setToolSettings }]],
-			]),
+			]) as ToolOptionsMap,
 			SeparatorType,
 		};
 	},
diff --git a/client/web/wasm/src/document.rs b/client/web/wasm/src/document.rs
index 9114704496..38f4dfa02e 100644
--- a/client/web/wasm/src/document.rs
+++ b/client/web/wasm/src/document.rs
@@ -27,11 +27,13 @@ pub fn select_tool(tool: String) -> Result<(), JsValue> {
 /// Update the settings for a given tool
 #[wasm_bindgen]
 pub fn set_tool_settings(tool: String, settings: &JsValue) -> Result<(), JsValue> {
-	let settings: ToolSettings = settings.into_serde().expect("Invalid JSON for ToolSettings");
-	EDITOR_STATE.with(|editor| match translate_tool(&tool) {
-		Some(tool) => editor.borrow_mut().handle_message(ToolMessage::SetToolSettings(tool, settings)).map_err(convert_error),
-		None => Err(Error::new(&format!("Couldn't select {} because it was not recognized as a valid tool", tool)).into()),
-	})
+	match settings.into_serde::<ToolSettings>() {
+		Ok(settings) => EDITOR_STATE.with(|editor| match translate_tool(&tool) {
+			Some(tool) => editor.borrow_mut().handle_message(ToolMessage::SetToolSettings(tool, settings)).map_err(convert_error),
+			None => Err(Error::new(&format!("Couldn't select {} because it was not recognized as a valid tool", tool)).into()),
+		}),
+		Err(err) => Err(Error::new(&format!("Invalud JSON for ToolSettings: {}", err)).into()),
+	}
 }
 
 #[wasm_bindgen]