diff --git a/chrome/content/zotero/xpcom/data/cachedTypes.js b/chrome/content/zotero/xpcom/data/cachedTypes.js
index 68009a681d..1d5ce84540 100644
--- a/chrome/content/zotero/xpcom/data/cachedTypes.js
+++ b/chrome/content/zotero/xpcom/data/cachedTypes.js
@@ -442,7 +442,12 @@ Zotero.ItemTypes = new function() {
 			return _customLabels[id];
 		}
 		
-		return Zotero.Schema.globalSchemaLocale.itemTypes[typeName];
+		var label = Zotero.Schema.globalSchemaLocale.itemTypes[typeName];
+		if (!label) {
+			Zotero.logError(`Localized string not available for item type '${typeName}'`);
+			label = Zotero.Utilities.Internal.camelToTitleCase(typeName);
+		}
+		return label;
 	}
 	
 	this.getImageSrc = function (itemType) {
diff --git a/chrome/content/zotero/xpcom/data/itemFields.js b/chrome/content/zotero/xpcom/data/itemFields.js
index d344485b6e..38e50970b4 100644
--- a/chrome/content/zotero/xpcom/data/itemFields.js
+++ b/chrome/content/zotero/xpcom/data/itemFields.js
@@ -77,15 +77,12 @@ Zotero.ItemFields = new function() {
 		
 		for (let field of fields) {
 			let isBaseField = baseFields.includes(field.fieldID);
-			let label;
-			try {
-				label = field.label || Zotero.Schema.globalSchemaLocale.fields[field.fieldName];
-			}
-			// Some base fields aren't localized
-			catch (e) {
-				if (!isBaseField) {
-					throw e;
-				}
+			let label = field.label || Zotero.Schema.globalSchemaLocale.fields[field.fieldName];
+			// If string not available, use the field name, except for some base fields that aren't
+			// used in the UI and therefore aren't localized
+			if (!label && !['number', 'type', 'medium'].includes(field.fieldName)) {
+				Zotero.logError(`Localized string not available for field '${field.fieldName}'`);
+				label = Zotero.Utilities.Internal.camelToTitleCase(field.fieldName);
 			}
 			
 			_fields[field.fieldID] = {
diff --git a/chrome/content/zotero/xpcom/utilities_internal.js b/chrome/content/zotero/xpcom/utilities_internal.js
index cdf50259bd..505d2b525b 100644
--- a/chrome/content/zotero/xpcom/utilities_internal.js
+++ b/chrome/content/zotero/xpcom/utilities_internal.js
@@ -1375,6 +1375,12 @@ Zotero.Utilities.Internal = {
 	},
 	
 	
+	camelToTitleCase: function (str) {
+		str = str.replace(/([A-Z])/g, " $1");
+		return str.charAt(0).toUpperCase() + str.slice(1);
+	},
+	
+	
 	resolveLocale: function (locale, locales) {
 		// If the locale exists as-is, use it
 		if (locales.includes(locale)) {