diff --git a/dashboard/static/index.html b/dashboard/static/index.html
index 3c4d3d6..ad42a24 100644
--- a/dashboard/static/index.html
+++ b/dashboard/static/index.html
@@ -191,8 +191,8 @@ function renGrid(containerId, ss, baseEq, reserve, headerStatsId, tradesTbId, ch
       '</div></div>';
   }
   document.getElementById(containerId).innerHTML=g;
-  // Chart
-  if(hist&&hist.length>0){var pts=[];for(var m=0;m<hist.length;m++)pts.push({time:hist[m].t,value:hist[m].v});chartSer.setData(pts);chartId.timeScale().fitContent()}
+  // Chart (skip if chartSer is null — caller handles separately)
+  if(chartSer && hist && hist.length>0){var pts=[];for(var m=0;m<hist.length;m++)pts.push({time:hist[m].t,value:hist[m].v});chartSer.setData(pts);chartId.timeScale().fitContent()}
   // Trades
   var rows='',trs=(trades||[]).slice(-20).reverse();
   for(var n=0;n<trs.length;n++){var t=trs[n];rows+='<tr><td>'+t.time+'</td><td>'+t.strategy+'</td><td class="'+(t.side.indexOf('BUY')>=0?'green':'red')+'">'+t.side+'</td><td>'+t.size+'</td><td>'+(t.price||'—')+'</td><td class="red">$'+(t.fee||0).toFixed(4)+'</td><td class="'+(t.pnl>=0?'green':'red')+'">'+(t.pnl>=0?'+':'')+'$'+Math.abs(t.pnl).toFixed(4)+'</td></tr>'}