Fix Create row modal inside linked row field fails if the primary field is of type formula array (baserow#4548)

Author: stribny

changelog/entries/unreleased/bug/type_error_formula_array.json

@@ -0,0 +1,9 @@
+{
+    "type": "bug",
+    "message": "Fix Create row modal inside linked row field fails if the primary field is of type formula array",
+    "issue_origin": "github",
+    "issue_number": 4547,
+    "domain": "database",
+    "bullet_points": [],
+    "created_at": "2026-01-15"
+}

web-frontend/modules/database/formula/formulaTypes.js

@@ -838,6 +838,10 @@ export class BaserowFormulaArrayType extends mix(
 
   toHumanReadableString(field, value) {
     const subType = this.getSubType(field)
+    if (!Array.isArray(value)) {
+      return ''
+    }
+
     return value
       .map((v) => {
         return subType.toHumanReadableString(