diff --git a/.env.development b/.env.development
index 241d8a9..98422f5 100644
--- a/.env.development
+++ b/.env.development
@@ -6,6 +6,6 @@ NEXT_PUBLIC_USE_MOCK_BACKEND_LOOP_START=false
 NEXT_PUBLIC_EXPORT_STATIC=false
 NEXT_PUBLIC_USE_CGI=false
 # App-Versionsnummer
-NEXT_PUBLIC_APP_VERSION=1.6.636
+NEXT_PUBLIC_APP_VERSION=1.6.637
 NEXT_PUBLIC_CPL_MODE=json   # json (Entwicklungsumgebung) oder jsSimulatedProd (CPL ->CGI-Interface-Simulator) oder production (CPL-> CGI-Interface Platzhalter)
 
diff --git a/.env.production b/.env.production
index 1b8faf7..53c8910 100644
--- a/.env.production
+++ b/.env.production
@@ -5,5 +5,5 @@ NEXT_PUBLIC_CPL_API_PATH=/CPL
 NEXT_PUBLIC_EXPORT_STATIC=true
 NEXT_PUBLIC_USE_CGI=true
 # App-Versionsnummer
-NEXT_PUBLIC_APP_VERSION=1.6.636
+NEXT_PUBLIC_APP_VERSION=1.6.637
 NEXT_PUBLIC_CPL_MODE=production
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9d7eaa6..9e1496e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+## [1.6.637] – 2025-07-23
+
+- feat: Add cursor wait during chart data loading
+
+- Implemented cursor wait state while chart data is being loaded in `AnalogInputsChart.tsx`.
+- Fixed missing dependencies in `useEffect` and defined `loading` state.
+- Updated `handleFetchData` to manage
+
+---
 ## [1.6.636] – 2025-07-23
 
 - Isolationsfehler in Display anzeigen -> aktuell Zahl ist rot ohne Beschrifftung , es soll Zahl ISO MOhm und Isolationsfehler
diff --git a/components/main/analogInputs/AnalogInputsChart.tsx b/components/main/analogInputs/AnalogInputsChart.tsx
index 340bcf0..17eedf1 100644
--- a/components/main/analogInputs/AnalogInputsChart.tsx
+++ b/components/main/analogInputs/AnalogInputsChart.tsx
@@ -28,6 +28,7 @@ import {
 } from "@/redux/slices/analogInputs/analogInputsHistorySlice";
 import { getColor } from "@/utils/colors";
 import AnalogInputsDatePicker from "./AnalogInputsDatePicker";
+import type { ChartJSOrUndefined } from "react-chartjs-2/dist/types";
 
 // ✅ Nur die Basis-ChartJS-Module registrieren
 ChartJS.register(
@@ -53,7 +54,11 @@ export default function AnalogInputsChart() {
   }, []);
 
   const dispatch = useDispatch<AppDispatch>();
-  const chartRef = useRef<Line>(null); // Specify Line type for chartRef
+
+  const chartRef =
+    useRef<
+      ChartJSOrUndefined<"line", { x: Date; y: number | undefined }[], unknown>
+    >(null);
 
   // Redux Werte für Chart-Daten
   const { zeitraum, vonDatum, bisDatum, data, autoLoad, selectedId } =
diff --git a/package-lock.json b/package-lock.json
index 1a17294..28b5b63 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.636",
+  "version": "1.6.637",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "cpl-v4",
-      "version": "1.6.636",
+      "version": "1.6.637",
       "dependencies": {
         "@fontsource/roboto": "^5.1.0",
         "@headlessui/react": "^2.2.4",
diff --git a/package.json b/package.json
index 850edb7..efe9ff4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.636",
+  "version": "1.6.637",
   "private": true,
   "scripts": {
     "dev": "next dev",