diff --git a/ide/src/trace/component/SpSystemTrace.ts b/ide/src/trace/component/SpSystemTrace.ts
index 74c893600bd83d8aae2dfab66f21c91cf61dec06..0970fb159303332f92b1924587626bfb43ed6d6a 100644
--- a/ide/src/trace/component/SpSystemTrace.ts
+++ b/ide/src/trace/component/SpSystemTrace.ts
@@ -348,6 +348,7 @@ export class SpSystemTrace extends BaseElement {
     for (let i = 0; i < flagList.length; i++) {
       if (flagList[i].type === 'triangle') {
         flagList.splice(i, 1);
+        this.timerShaftELFlagChange(this.hoverFlag, null);
         i--;
       }
     }
@@ -355,8 +356,10 @@ export class SpSystemTrace extends BaseElement {
 
   pushPidToSelection(selection: SelectionParam, id: string): void {
     let pid = parseInt(id);
-    if (!selection.processIds.includes(pid)) {
-      selection.processIds.push(pid);
+    if (!isNaN(pid)) {
+      if (!selection.processIds.includes(pid)) {
+        selection.processIds.push(pid);
+      }
     }
   }
   // @ts-ignore