diff --git a/superset-frontend/src/views/CRUD/hooks.ts b/superset-frontend/src/views/CRUD/hooks.ts
index fb16713c6d1c..9ec1104341cc 100644
--- a/superset-frontend/src/views/CRUD/hooks.ts
+++ b/superset-frontend/src/views/CRUD/hooks.ts
@@ -39,13 +39,18 @@ interface ListViewResourceState<D extends object = any> {
 }
 
 const parsedErrorMessage = (
-  errorMessage: Record<string, string[]> | string,
+  errorMessage: Record<string, string[] | string> | string,
 ) => {
   if (typeof errorMessage === 'string') {
     return errorMessage;
   }
   return Object.entries(errorMessage)
-    .map(([key, value]) => `(${key}) ${value.join(', ')}`)
+    .map(([key, value]) => {
+      if (Array.isArray(value)) {
+        return `(${key}) ${value.join(', ')}`;
+      }
+      return `(${key}) ${value}`;
+    })
     .join('\n');
 };
 
@@ -200,7 +205,7 @@ export function useListViewResource<D extends object = any>(
 interface SingleViewResourceState<D extends object = any> {
   loading: boolean;
   resource: D | null;
-  error: string | Record<string, string[]> | null;
+  error: string | Record<string, string[] | string> | null;
 }
 
 export function useSingleViewResource<D extends object = any>(
@@ -236,7 +241,7 @@ export function useSingleViewResource<D extends object = any>(
             });
             return json.result;
           },
-          createErrorHandler((errMsg: Record<string, string[]>) => {
+          createErrorHandler((errMsg: Record<string, string[] | string>) => {
             handleErrorMsg(
               t(
                 'An error occurred while fetching %ss: %s',
@@ -277,7 +282,7 @@ export function useSingleViewResource<D extends object = any>(
             });
             return json.id;
           },
-          createErrorHandler((errMsg: Record<string, string[]>) => {
+          createErrorHandler((errMsg: Record<string, string[] | string>) => {
             handleErrorMsg(
               t(
                 'An error occurred while creating %ss: %s',
@@ -391,19 +396,21 @@ export function useImportResource(
     payload.includes('already exists and `overwrite=true` was not passed');
 
   const getPasswordsNeeded = (
-    errMsg: Record<string, Record<string, string[]>>,
+    errMsg: Record<string, Record<string, string[] | string>>,
   ) =>
     Object.entries(errMsg)
       .filter(([, validationErrors]) => isNeedsPassword(validationErrors))
       .map(([fileName]) => fileName);
 
-  const getAlreadyExists = (errMsg: Record<string, Record<string, string[]>>) =>
+  const getAlreadyExists = (
+    errMsg: Record<string, Record<string, string[] | string>>,
+  ) =>
     Object.entries(errMsg)
       .filter(([, validationErrors]) => isAlreadyExists(validationErrors))
       .map(([fileName]) => fileName);
 
   const hasTerminalValidation = (
-    errMsg: Record<string, Record<string, string[]>>,
+    errMsg: Record<string, Record<string, string[] | string>>,
   ) =>
     Object.values(errMsg).some(
       validationErrors =>
@@ -631,7 +638,7 @@ export const testDatabaseConnection = (
     () => {
       addSuccessToast(t('Connection looks good!'));
     },
-    createErrorHandler((errMsg: Record<string, string[]> | string) => {
+    createErrorHandler((errMsg: Record<string, string[] | string> | string) => {
       handleErrorMsg(t(`${t('ERROR: ')}${parsedErrorMessage(errMsg)}`));
     }),
   );
diff --git a/superset-frontend/src/views/CRUD/utils.tsx b/superset-frontend/src/views/CRUD/utils.tsx
index d0a5ca6d7b75..b7933f8163ae 100644
--- a/superset-frontend/src/views/CRUD/utils.tsx
+++ b/superset-frontend/src/views/CRUD/utils.tsx
@@ -156,7 +156,9 @@ export const createFetchRelated = createFetchResourceMethod('related');
 export const createFetchDistinct = createFetchResourceMethod('distinct');
 
 export function createErrorHandler(
-  handleErrorFunc: (errMsg?: string | Record<string, string[]>) => void,
+  handleErrorFunc: (
+    errMsg?: string | Record<string, string[] | string>,
+  ) => void,
 ) {
   return async (e: SupersetClientResponse | string) => {
     const parsedError = await getClientErrorObject(e);