fix: three bugs from second code review

app.js

@@ -341,7 +341,6 @@ async function removeMatch(id) {
     toggleLoading(true);
 
     try {
-        const match = state.matches.find(m => m.id === id);
         await deleteMatch(id);
 
         state.matches = state.matches.filter(m => m.id !== id);

src/chart.js

@@ -184,6 +184,10 @@ export function renderEloChart(type = 'singles') {
         .sort((a, b) => a[1].name.localeCompare(b[1].name));
 
     if (activePlayers.length === 0) {
+        if (chartInstance) {
+            chartInstance.destroy();
+            chartInstance = null;
+        }
         let msg = canvas.parentElement.querySelector('.chart-empty-msg');
         if (!msg) {
             msg = document.createElement('p');

src/state.js

@@ -41,14 +41,26 @@ export function persistMatches() {
 
 export function loadLocalPlayers() {
     const raw = localStorage.getItem('eloPlayers');
-    if (raw) state.players = JSON.parse(raw);
-    return !!raw;
+    if (!raw) return false;
+    try {
+        state.players = JSON.parse(raw);
+        return true;
+    } catch {
+        localStorage.removeItem('eloPlayers');
+        return false;
+    }
 }
 
 export function loadLocalMatches() {
     const raw = localStorage.getItem('eloMatches');
-    if (raw) state.matches = JSON.parse(raw);
-    return !!raw;
+    if (!raw) return false;
+    try {
+        state.matches = JSON.parse(raw);
+        return true;
+    } catch {
+        localStorage.removeItem('eloMatches');
+        return false;
+    }
 }
 
 // ================= STATISTIK-NEUBERECHNUNG =================