diff --git a/tools/upend_js/index.ts b/tools/upend_js/index.ts
index 429a8ba..e57144b 100644
--- a/tools/upend_js/index.ts
+++ b/tools/upend_js/index.ts
@@ -67,9 +67,9 @@ export class UpObject {
     );
   }
 
-  private _attr: { [key: string]: UpEntry[] } | undefined;
+  private _attr: Record<string, UpEntry[] | undefined> | undefined;
 
-  public get attr() {
+  public get attr(): Record<string, UpEntry[] | undefined> {
     if (!this._attr) {
       const result = {} as { [key: string]: UpEntry[] };
       this.attributes.forEach((entry) => {
@@ -94,8 +94,8 @@ export class UpObject {
     return this._attr;
   }
 
-  public get(attr: string) {
-    return this.attr[attr] ? this.attr[attr][0].value.c : undefined;
+  public get(attr: string): string | number | null | undefined {
+    return this.attr[attr]?.[0].value.c;
   }
 
   public identify(): string[] {
diff --git a/tools/upend_js/package.json b/tools/upend_js/package.json
index 90381ab..468e592 100644
--- a/tools/upend_js/package.json
+++ b/tools/upend_js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@upnd/upend",
-  "version": "0.3.2",
+  "version": "0.3.3",
   "description": "Client library to interact with the UpEnd system.",
   "scripts": {
     "build": "tsc --build --verbose",
diff --git a/webui/src/lib/components/Inspect.svelte b/webui/src/lib/components/Inspect.svelte
index b4c6350..b66bb46 100644
--- a/webui/src/lib/components/Inspect.svelte
+++ b/webui/src/lib/components/Inspect.svelte
@@ -237,7 +237,7 @@
 				});
 				break;
 			case 'entry-delete': {
-				const inEntry = $entity?.attr[`~${ATTR_IN}`].find((e) => e.entity === change.address);
+				const inEntry = $entity?.attr[`~${ATTR_IN}`]?.find((e) => e.entity === change.address);
 				if (inEntry) {
 					await api.deleteEntry(inEntry.address);
 				} else {
diff --git a/webui/src/lib/components/MultiGroupEditor.svelte b/webui/src/lib/components/MultiGroupEditor.svelte
index bdd845c..cc65a6e 100644
--- a/webui/src/lib/components/MultiGroupEditor.svelte
+++ b/webui/src/lib/components/MultiGroupEditor.svelte
@@ -26,7 +26,7 @@
 				.map((v) => v.c as string)
 				.filter((groupAddr) => {
 					return Object.values(allGroups.objects).every((obj) => {
-						return obj.attr[ATTR_IN].some((v) => v.value.c === groupAddr);
+						return obj.attr[ATTR_IN]?.some((v) => v.value.c === groupAddr);
 					});
 				})
 		);
@@ -55,7 +55,7 @@
 	async function removeGroup(address: string) {
 		await Promise.all(
 			entities.map((entity) => {
-				const group = groupListing?.objects[entity].attr[ATTR_IN].find(
+				const group = groupListing?.objects[entity].attr[ATTR_IN]?.find(
 					(v) => v.value.c === address
 				);
 				if (group) {
diff --git a/webui/src/lib/components/display/blobs/ImageViewer.svelte b/webui/src/lib/components/display/blobs/ImageViewer.svelte
index 8f652ac..476a20b 100644
--- a/webui/src/lib/components/display/blobs/ImageViewer.svelte
+++ b/webui/src/lib/components/display/blobs/ImageViewer.svelte
@@ -57,7 +57,7 @@
 				if (annotation.get('W3C_FRAGMENT_SELECTOR')) {
 					anno.addAnnotation({
 						type: 'Annotation',
-						body: annotation.attr[ATTR_LABEL].map((e) => {
+						body: (annotation.attr[ATTR_LABEL] || []).map((e) => {
 							return {
 								type: 'TextualBody',
 								value: String(e.value.c),
@@ -145,9 +145,9 @@
 		anno.on('updateAnnotation', async (annotation) => {
 			const annotationObject = await api.fetchEntity(annotation.id);
 			await Promise.all(
-				annotationObject.attr[ATTR_LABEL].concat(
-					annotationObject.attr['W3C_FRAGMENT_SELECTOR']
-				).map(async (e) => api.deleteEntry(e.address))
+				(annotationObject.attr[ATTR_LABEL] || [])
+					.concat(annotationObject.attr['W3C_FRAGMENT_SELECTOR'] || [])
+					.map(async (e) => api.deleteEntry(e.address))
 			);
 			await api.putEntry([
 				{