--- a/devtools/client/aboutdebugging-new/src/actions/debug-targets.js
+++ b/devtools/client/aboutdebugging-new/src/actions/debug-targets.js
@@ -61,17 +61,18 @@ function inspectDebugTarget(type, id) {
           await debugRemoteAddon(id, devtoolsClient);
         } else if (runtimeType === RUNTIMES.THIS_FIREFOX) {
           debugLocalAddon(id);
         }
         break;
       }
       case DEBUG_TARGETS.WORKER: {
         // Open worker toolbox in new window.
-        const front = runtimeDetails.client.client.getActor(id);
+        const devtoolsClient = runtimeDetails.clientWrapper.client;
+        const front = devtoolsClient.getActor(id);
         gDevToolsBrowser.openWorkerToolbox(front);
         break;
       }
 
       default: {
         console.error("Failed to inspect the debug target of " +
                       `type: ${ type } id: ${ id }`);
       }