diff --git a/Core/API/Parameter/ArrayType.class.php b/Core/API/Parameter/ArrayType.class.php
index 133ca4f..d55b154 100644
--- a/Core/API/Parameter/ArrayType.class.php
+++ b/Core/API/Parameter/ArrayType.class.php
@@ -24,7 +24,7 @@ class ArrayType extends Parameter {
   }
 
   public function parseParam($value): bool {
-    if(!is_array($value)) {
+    if (!is_array($value)) {
       if (!$this->canBeOne) {
         return false;
       } else {
diff --git a/Core/API/Request.class.php b/Core/API/Request.class.php
index a4ba499..2f1b0a6 100644
--- a/Core/API/Request.class.php
+++ b/Core/API/Request.class.php
@@ -93,7 +93,7 @@ abstract class Request {
     foreach ($structure as $name => $param) {
       $value = $values[$name] ?? NULL;
 
-      $isEmpty = (is_string($value) && strlen($value) === 0) || (is_array($value) && empty($value));
+      $isEmpty = is_string($value) && strlen($value) === 0;
       if (!$param->optional && (is_null($value) || $isEmpty)) {
         return $this->createError("Missing parameter: $name");
       }
diff --git a/react/admin-panel/src/views/access-control-list.js b/react/admin-panel/src/views/access-control-list.js
index 4205004..bf20f64 100644
--- a/react/admin-panel/src/views/access-control-list.js
+++ b/react/admin-panel/src/views/access-control-list.js
@@ -1,9 +1,23 @@
 import {useCallback, useContext, useEffect, useState} from "react";
 import {LocaleContext} from "shared/locale";
 import {Link, useNavigate} from "react-router-dom";
-import {Button, Checkbox, TextField, Paper, Table, TableBody, TableCell, TableContainer, TableHead, TableRow} from "@material-ui/core";
-import {Add, Refresh} from "@material-ui/icons";
+import {
+    Button,
+    Checkbox,
+    TextField,
+    Paper,
+    Table,
+    TableBody,
+    TableCell,
+    TableContainer,
+    TableHead,
+    TableRow,
+    IconButton
+} from "@material-ui/core";
+import {Add, Delete, Edit, Refresh} from "@material-ui/icons";
 import {USER_GROUP_ADMIN} from "shared/constants";
+import Dialog from "shared/elements/dialog";
+import {TableFooter} from "@mui/material";
 
 
 export default function AccessControlList(props) {
@@ -20,6 +34,9 @@ export default function AccessControlList(props) {
     // filters
     const [query, setQuery] = useState("");
 
+    // view
+    const [dialogData, setDialogData] = useState({open: false});
+
     const onFetchACL = useCallback((force = false) => {
         if (force || fetchACL) {
             setFetchACL(false);
@@ -84,8 +101,33 @@ export default function AccessControlList(props) {
         }
     }, [acl]);
 
+    const onDeletePermission = useCallback(method => {
+        props.api.deletePermission(method).then(data => {
+            if (data.success) {
+                let newACL = acl.filter(acl => acl.method.toLowerCase() !== method.toLowerCase());
+                setACL(newACL);
+            } else {
+                props.showDialog("Error deleting permission: " + data.msg);
+            }
+        })
+    }, [acl]);
+
+    const onUpdatePermission = useCallback((inputData, groups) => {
+        props.api.updatePermission(inputData.method, groups, inputData.description).then(data => {
+            if (data.success) {
+                let newACL = acl.filter(acl => acl.method.toLowerCase() !== inputData.method.toLowerCase());
+                newACL.push({method: inputData.method, groups: groups, description: inputData.description});
+                newACL = newACL.sort((a, b) => a.method.localeCompare(b.method))
+                setACL(newACL);
+            } else {
+                props.showDialog("Error updating permission: " + data.msg);
+            }
+        })
+    }, [acl]);
+
     const isRestricted = (method) => {
-        return ["permissions/update", "permissions/delete"].includes(method.toLowerCase());
+        return ["permissions/update", "permissions/delete"].includes(method.toLowerCase()) &&
+                !props.api.hasGroup(USER_GROUP_ADMIN);
     }
 
     const PermissionList = () => {
@@ -104,13 +146,44 @@ export default function AccessControlList(props) {
             rows.push(
                 <TableRow key={"perm-" + index}>
                     <TableCell>
-                        <b>{permission.method}</b><br />
-                        <i>{permission.description}</i>
+                        <div style={{display: "grid", gridTemplateColumns: "60px auto"}}>
+                            <div style={{alignSelf: "center"}}>
+                                <IconButton style={{padding: 0}} size={"small"} color={"primary"}
+                                            disabled={isRestricted(permission.method)}
+                                            onClick={() => setDialogData({
+                                                open: true,
+                                                title: L("Edit permission"),
+                                                inputs: [
+                                                    { type: "label", value: L("general.method") + ":" },
+                                                    { type: "text", name: "method", value: permission.method, disabled: true },
+                                                    { type: "label", value: L("general.description") + ":" },
+                                                    { type: "text", name: "description", value: permission.description, maxLength: 128 }
+                                                ],
+                                                onOption: (option, inputData) => option === 0 && onUpdatePermission(inputData, permission.groups)
+                                            })} >
+                                    <Edit />
+                                </IconButton>
+                                <IconButton style={{padding: 0}} size={"small"} color={"secondary"}
+                                            disabled={isRestricted(permission.method)}
+                                            onClick={() => setDialogData({
+                                                open: true,
+                                                title: L("Do you really want to delete this permission?"),
+                                                message: "Method: " + permission.method,
+                                                onOption: (option) => option === 0 && onDeletePermission(permission.method)
+                                            })} >
+                                    <Delete />
+                                </IconButton>
+                            </div>
+                            <div>
+                                <b>{permission.method}</b><br />
+                                <i>{permission.description}</i>
+                            </div>
+                        </div>
                     </TableCell>
                     {groups.map(group => <TableCell key={"perm-" + index + "-group-" + group.id} align={"center"}>
                         <Checkbox checked={!permission.groups.length || permission.groups.includes(group.id)}
                                   onChange={(e) => onChangePermission(index, group.id, e.target.checked)}
-                                  disabled={isRestricted(permission.method) || !props.api.hasGroup(USER_GROUP_ADMIN)} />
+                                  disabled={isRestricted(permission.method)} />
                     </TableCell>)}
                 </TableRow>
             );
@@ -155,18 +228,28 @@ export default function AccessControlList(props) {
                         {L("general.reload")}
                     </Button>
                     <Button variant={"outlined"} className={"m-1"} startIcon={<Add />} disabled={!props.api.hasGroup(USER_GROUP_ADMIN)}
-                            onClick={() => navigate("/admin/acl/new")}>
+                            onClick={() => setDialogData({
+                                open: true,
+                                title: L("Add permission"),
+                                inputs: [
+                                    { type: "label", value: L("general.method") + ":" },
+                                    { type: "text", name: "method", value: "", placeholder: L("general.method") },
+                                    { type: "label", value: L("general.description") + ":" },
+                                    { type: "text", name: "description", maxLength: 128, placeholder: L("general.description") }
+                                ],
+                                onOption: (option, inputData) => option === 0 && onUpdatePermission(inputData, [])
+                            })} >
                         {L("general.add")}
                     </Button>
                 </div>
             </div>
         </div>
         <div>
-            <TableContainer component={Paper}>
-                <Table size={"small"}>
+            <TableContainer component={Paper} style={{overflowX: "initial"}}>
+                <Table stickyHeader size={"small"} className={"table-striped"}>
                     <TableHead>
                         <TableRow>
-                            <TableCell sx={{width: "auto"}}>{L("permission")}</TableCell>
+                            <TableCell>{L("permission")}</TableCell>
                             { groups.map(group => <TableCell key={"group-" + group.id} align={"center"}>
                                 {group.name}
                             </TableCell>) }
@@ -178,5 +261,13 @@ export default function AccessControlList(props) {
                 </Table>
             </TableContainer>
         </div>
+        <Dialog show={dialogData.open}
+                onClose={() => setDialogData({open: false})}
+                title={dialogData.title}
+                message={dialogData.message}
+                onOption={dialogData.onOption}
+                inputs={dialogData.inputs}
+                options={[L("general.ok"), L("general.cancel")]} />
+
     </>
 }
\ No newline at end of file
diff --git a/react/shared/elements/dialog.jsx b/react/shared/elements/dialog.jsx
index 0998663..c415f0d 100644
--- a/react/shared/elements/dialog.jsx
+++ b/react/shared/elements/dialog.jsx
@@ -7,7 +7,7 @@ import {
     DialogContent,
     DialogContentText,
     DialogTitle,
-    Input, List, ListItem, TextField
+    List, ListItem, TextField
 } from "@mui/material";
 
 export default function Dialog(props) {
@@ -24,7 +24,9 @@ export default function Dialog(props) {
         if (props.inputs) {
             let initialData = {};
             for (const input of props.inputs) {
-                initialData[input.name] = input.value || "";
+                if (input.type !== "label") {
+                    initialData[input.name] = input.value || "";
+                }
             }
             setInputData(initialData);
         }
@@ -47,6 +49,9 @@ export default function Dialog(props) {
         delete inputProps.type;
 
         switch (input.type) {
+            case 'label':
+                inputElements.push(<span {...inputProps}>{input.value}</span>);
+                break;
             case 'text':
             case 'password':
                 inputElements.push(<TextField
@@ -56,6 +61,7 @@ export default function Dialog(props) {
                     size={"small"} fullWidth={true}
                     key={"input-" + input.name}
                     value={inputData[input.name] || ""}
+                    defaultValue={input.defaultValue || ""}
                     onChange={e => setInputData({ ...inputData, [input.name]: e.target.value })}
                 />)
                 break;
diff --git a/react/shared/hooks/async-search.js b/react/shared/hooks/async-search.js
index b1584a9..fff51e7 100644
--- a/react/shared/hooks/async-search.js
+++ b/react/shared/hooks/async-search.js
@@ -5,6 +5,7 @@ export default function useAsyncSearch(callback, minLength = 1) {
 
     const [searchString, setSearchString] = useState("");
     const [results, setResults] = useState(null);
+    const [isSearching, setSearching] = useState(false);
 
     useEffect(() => {
         if (minLength > 0 && (!searchString || searchString.length < minLength)) {
@@ -12,9 +13,13 @@ export default function useAsyncSearch(callback, minLength = 1) {
             return;
         }
 
-        callback(searchString).then(results => {
-            setResults(results || null);
-        });
+        if (!isSearching) {
+            setSearching(true);
+            callback(searchString).then(results => {
+                setResults(results || null);
+                setSearching(false);
+            });
+        }
     }, [searchString]);
 
     return [searchString, setSearchString, results];