diff --git a/packages/trace-viewer/src/ui/callTab.css b/packages/trace-viewer/src/ui/callTab.css
index 00aa1fe3bb..c9d3191732 100644
--- a/packages/trace-viewer/src/ui/callTab.css
+++ b/packages/trace-viewer/src/ui/callTab.css
@@ -96,4 +96,5 @@
 
 .call-tab .error-message {
   padding: 5px;
+  line-height: 17px;
 }
diff --git a/packages/trace-viewer/src/ui/modelUtil.ts b/packages/trace-viewer/src/ui/modelUtil.ts
index 35f236a19e..2028bdb5f8 100644
--- a/packages/trace-viewer/src/ui/modelUtil.ts
+++ b/packages/trace-viewer/src/ui/modelUtil.ts
@@ -90,6 +90,11 @@ export class MultiTraceModel {
     this.resources.sort((a1, a2) => a1._monotonicTime! - a2._monotonicTime!);
     this.sources = collectSources(this.actions);
   }
+
+  failedAction() {
+    // This find innermost action for nested ones.
+    return this.actions.findLast(a => a.error);
+  }
 }
 
 function indexModel(context: ContextEntry) {
diff --git a/packages/trace-viewer/src/ui/workbench.tsx b/packages/trace-viewer/src/ui/workbench.tsx
index 56bcb611ee..bc21f2e3b6 100644
--- a/packages/trace-viewer/src/ui/workbench.tsx
+++ b/packages/trace-viewer/src/ui/workbench.tsx
@@ -65,7 +65,7 @@ export const Workbench: React.FunctionComponent<{
   React.useEffect(() => {
     if (selectedAction && model?.actions.includes(selectedAction))
       return;
-    const failedAction = model?.actions.find(a => a.error);
+    const failedAction = model?.failedAction();
     if (initialSelection && model?.actions.includes(initialSelection))
       setSelectedAction(initialSelection);
     else if (failedAction)