Fix #55895

src/vs/workbench/parts/preferences/browser/settingsTree.ts

@@ -1250,7 +1250,9 @@ function getDisplayEnumOptions(setting: ISetting): string[] {
 			});
 	}
 
-	return setting.enum.map(escapeInvisibleChars);
+	return setting.enum
+		.map(String)
+		.map(escapeInvisibleChars);
 }
 
 function escapeInvisibleChars(enumValue: string): string {

src/vs/workbench/services/preferences/common/preferencesModels.ts

@@ -899,7 +899,7 @@ class SettingsContentBuilder {
 
 		if (setting.enumDescriptions && setting.enumDescriptions.some(desc => !!desc)) {
 			setting.enumDescriptions.forEach((desc, i) => {
-				const displayEnum = escapeInvisibleChars(setting.enum[i]);
+				const displayEnum = escapeInvisibleChars(String(setting.enum[i]));
 				const line = desc ?
 					`${displayEnum}: ${fixSettingLink(desc)}` :
 					displayEnum;