diff --git a/proxmox/api/client.go b/proxmox/api/client.go
index 18bd0261..663dc9c9 100644
--- a/proxmox/api/client.go
+++ b/proxmox/api/client.go
@@ -334,11 +334,22 @@ func validateResponseCode(res *http.Response) error {
 		errRes := &ErrorResponseBody{}
 
 		err := json.NewDecoder(res.Body).Decode(errRes)
-		if err == nil && errRes.Errors != nil {
+		if err == nil {
 			var errList []string
 
-			for k, v := range *errRes.Errors {
-				errList = append(errList, fmt.Sprintf("%s: %s", k, strings.TrimRight(v, "\n\r")))
+			if errRes.Errors != nil {
+				for k, v := range *errRes.Errors {
+					errList = append(errList, fmt.Sprintf("%s: %s", k, strings.TrimRight(v, "\n\r")))
+				}
+			}
+
+			if errRes.Message != nil && *errRes.Message != "" {
+				split := slices.Compact(strings.Split(*errRes.Message, "\n"))
+				// skip empty lines and the first line, which is a duplicate of the HTTP status message
+				split = slices.DeleteFunc(split, func(s string) bool {
+					return len(s) == 0 || strings.HasPrefix(s, msg)
+				})
+				errList = append(errList, split...)
 			}
 
 			msg = fmt.Sprintf("%s (%s)", msg, strings.Join(errList, " - "))
diff --git a/proxmox/api/client_test.go b/proxmox/api/client_test.go
index 36706f50..e77215b5 100644
--- a/proxmox/api/client_test.go
+++ b/proxmox/api/client_test.go
@@ -9,6 +9,7 @@ package api
 import (
 	"context"
 	"errors"
+	"io"
 	"net/http"
 	"reflect"
 	"strconv"
@@ -53,6 +54,7 @@ func TestClientDoRequest(t *testing.T) {
 	tests := []struct {
 		name    string
 		status  string
+		body    string
 		wantErr error
 	}{
 		{name: "no error", status: "200 OK", wantErr: nil},
@@ -62,6 +64,15 @@ func TestClientDoRequest(t *testing.T) {
 			Code:    500,
 			Message: "Internal Server Error",
 		}},
+		{
+			name:   "500 status with body",
+			status: "500 create sdn zone object failed: 400 Parameter verification failed.",
+			body:   `{"message":"create sdn zone object failed: 400 Parameter verification failed.\nipam: ipam-simple not existing\n","data":null}`,
+			wantErr: &HTTPError{
+				Code:    500,
+				Message: "create sdn zone object failed: 400 Parameter verification failed. (ipam: ipam-simple not existing)",
+			},
+		},
 	}
 
 	for _, tt := range tests {
@@ -77,7 +88,7 @@ func TestClientDoRequest(t *testing.T) {
 						return &http.Response{
 							Status:     tt.status,
 							StatusCode: sc,
-							Body:       nil,
+							Body:       io.NopCloser(strings.NewReader(tt.body)),
 						}
 					}),
 				},
diff --git a/proxmox/api/client_types.go b/proxmox/api/client_types.go
index c3ee7f77..ecfbd2a4 100644
--- a/proxmox/api/client_types.go
+++ b/proxmox/api/client_types.go
@@ -20,8 +20,9 @@ type MultiPartData struct {
 
 // ErrorResponseBody contains the body of an error response.
 type ErrorResponseBody struct {
-	Data   *string            `json:"data"`
-	Errors *map[string]string `json:"errors"`
+	Data    *string            `json:"data"`
+	Message *string            `json:"message"`
+	Errors  *map[string]string `json:"errors"`
 }
 
 // FileUploadRequest is a request for uploading a file.