Fix header icon

packages/frontend-core/src/components/grid/lib/utils.js

@@ -1,3 +1,4 @@
+import { BBReferenceFieldSubType, FieldType } from "@budibase/types"
 import { TypeIconMap } from "../../../constants"
 
 export const getColor = (idx, opacity = 0.3) => {
@@ -11,7 +12,16 @@ export const getColumnIcon = column => {
   if (column.schema.autocolumn) {
     return "MagicWand"
   }
-  const { type, subtype } = column.schema
+
+  const { type, subtype, constraints } = column.schema
+  if (
+    type === FieldType.BB_REFERENCE &&
+    subtype === BBReferenceFieldSubType.USER &&
+    constraints?.type !== "array"
+  ) {
+    // This will handle old single users columns
+    return "User"
+  }
 
   const result =
     typeof TypeIconMap[type] === "object" && subtype