Validate single reference not being an array

packages/server/src/utilities/rowProcessor/bbReferenceProcessor.ts

@@ -39,6 +39,8 @@ export async function processInputBBReferences<
   type: T,
   subtype?: TS
 ): Promise<string | string[] | null> {
+  switch (type) {
+    case FieldType.BB_REFERENCE:
       let referenceIds: string[] = []
 
       if (Array.isArray(value)) {
@@ -69,8 +71,6 @@ export async function processInputBBReferences<
         }
       })
 
-  switch (type) {
-    case FieldType.BB_REFERENCE:
       switch (subtype) {
         case undefined:
           throw "Subtype must be defined"
@@ -93,13 +93,19 @@ export async function processInputBBReferences<
       }
 
     case FieldType.BB_REFERENCE_SINGLE: {
-      const user = await cache.user.getUser(referenceIds[0])
-
-      if (!user) {
-        throw new InvalidBBRefError(referenceIds[0], FieldSubtype.USER)
+      if (value && Array.isArray(value)) {
+        throw "BB_REFERENCE_SINGLE cannot be an array"
       }
 
-      return referenceIds[0] || null
+      const id = typeof value === "string" ? value : value._id
+
+      const user = await cache.user.getUser(id)
+
+      if (!user) {
+        throw new InvalidBBRefError(id, FieldSubtype.USER)
+      }
+
+      return user._id || null
     }
 
     default: