diff --git a/yajsapi/rest/activity.ts b/yajsapi/rest/activity.ts
index 9c718a073..e3aa742ce 100755
--- a/yajsapi/rest/activity.ts
+++ b/yajsapi/rest/activity.ts
@@ -201,8 +201,13 @@ class Activity {
       }
     } catch (error) {
       logger.error(`Failed to destroy activity: ${this._id}`);
+    } finally {
+      try {
+        await this._api.destroyActivity(this._id);
+      } catch (error) {
+        //suppress api error
+      }
     }
-    await this._api.destroyActivity(this._id);
   }
 }
 
diff --git a/yajsapi/runner/events.ts b/yajsapi/runner/events.ts
index d67aaf424..ab9cd5c10 100644
--- a/yajsapi/runner/events.ts
+++ b/yajsapi/runner/events.ts
@@ -98,8 +98,8 @@ export class NoProposalsConfirmed extends YaEvent {
 
   constructor({ num_offers, timeout }) {
     super();
-    if (num_offers) this.num_offers = num_offers;
-    if (timeout) this.timeout = timeout;
+    this.num_offers = num_offers;
+    this.timeout = timeout;
   }
 }
 
@@ -277,10 +277,20 @@ export class ScriptFinished extends ScriptEvent {
 
 export class TaskAccepted extends TaskEvent {
   result?: any;
+  constructor({ task_id, result }) {
+    super();
+    if (task_id) this.task_id = task_id;
+    if (result) this.result = result;
+  }
 }
 
 export class TaskRejected extends TaskEvent {
   reason?: string | null;
+  constructor({ task_id, reason }) {
+    super();
+    if (task_id) this.task_id = task_id;
+    if (reason) this.reason = reason;
+  }
 }
 
 export class DownloadStarted extends YaEvent {
diff --git a/yajsapi/runner/index.ts b/yajsapi/runner/index.ts
index 8b010bf7e..b525ffbd2 100755
--- a/yajsapi/runner/index.ts
+++ b/yajsapi/runner/index.ts
@@ -258,7 +258,7 @@ export class Engine {
       builder.ensure(constraint);
     }
     for (let x of multi_payment_decoration.properties) {
-        builder._props[x.key] = x.value;
+      builder._props[x.key] = x.value;
     }
     await this._demand_decor.decorate_demand(builder);
     await this._strategy.decorate_demand(builder);
@@ -455,7 +455,7 @@ export class Engine {
 
       let _act;
       try {
-        _act = await activity_api.create_activity(agreement, secure)
+        _act = await activity_api.create_activity(agreement, secure);
       } catch (error) {
         emit(new events.ActivityCreateFailed({ agr_id: agreement.id() }));
         throw error;
@@ -484,98 +484,104 @@ export class Engine {
             storage_manager,
             emit
           );
-          let consumer = work_queue.new_consumer();
-
-          let command_generator = worker(work_context, task_emitter(consumer));
-          for await (let batch of command_generator) {
-            try {
-              let current_worker_task = consumer.last_item();
-              if (current_worker_task) {
+          await asyncWith(work_queue.new_consumer(), async (consumer) => {
+            let command_generator = worker(
+              work_context,
+              task_emitter(consumer)
+            );
+            for await (let batch of command_generator) {
+              try {
+                let current_worker_task = consumer.last_item();
+                if (current_worker_task) {
+                  emit(
+                    new events.TaskStarted({
+                      agr_id: agreement.id(),
+                      task_id: current_worker_task.id,
+                      task_data: current_worker_task.data(),
+                    })
+                  );
+                }
+                let task_id = current_worker_task
+                  ? current_worker_task.id
+                  : null;
+                batch.attestation = {
+                  credentials: act.credentials,
+                  nonce: act.id,
+                  exeunitHashes: act.exeunitHashes,
+                };
+                await batch.prepare();
+                let cc = new CommandContainer();
+                batch.register(cc);
+                let remote = await act.exec(cc.commands());
                 emit(
-                  new events.TaskStarted({
+                  new events.ScriptSent({
                     agr_id: agreement.id(),
-                    task_id: current_worker_task.id,
-                    task_data: current_worker_task.data(),
+                    task_id: task_id,
+                    cmds: cc.commands(),
                   })
                 );
-              }
-              let task_id = current_worker_task ? current_worker_task.id : null;
-              batch.attestation = {
-                credentials: act.credentials,
-                nonce: act.id,
-                exeunitHashes: act.exeunitHashes
-              };
-              await batch.prepare();
-              let cc = new CommandContainer();
-              batch.register(cc);
-              let remote = await act.exec(cc.commands());
-              emit(
-                new events.ScriptSent({
-                  agr_id: agreement.id(),
-                  task_id: task_id,
-                  cmds: cc.commands(),
-                })
-              );
-              try {
-                for await (let step of remote) {
-                  batch.output.push(step);
+                try {
+                  for await (let step of remote) {
+                    batch.output.push(step);
+                    emit(
+                      new events.CommandExecuted({
+                        success: true,
+                        agr_id: agreement.id(),
+                        task_id: task_id,
+                        command: cc.commands()[step.idx],
+                        message: step.message,
+                        cmd_idx: step.idx,
+                      })
+                    );
+                  }
+                } catch (error) {
+                  // assert len(err.args) >= 2
+                  const { name: cmd_idx , description } = error;
+                  //throws new CommandExecutionError from activity#355
                   emit(
                     new events.CommandExecuted({
-                      success: true,
+                      success: false,
                       agr_id: agreement.id(),
                       task_id: task_id,
-                      command: cc.commands()[step.idx],
-                      message: step.message,
-                      cmd_idx: step.idx,
+                      command: cc.commands()[cmd_idx],
+                      message: description,
+                      cmd_idx: cmd_idx,
                     })
                   );
+                  throw error;
                 }
-              } catch (error) {
-                // assert len(err.args) >= 2
-                const [cmd_msg, cmd_idx] = error;
                 emit(
-                  new events.CommandExecuted({
-                    success: false,
+                  new events.GettingResults({
                     agr_id: agreement.id(),
                     task_id: task_id,
-                    command: cc.commands()[cmd_idx],
-                    message: cmd_msg,
-                    cmd_idx: cmd_idx,
                   })
                 );
-                throw error;
-              }
-              emit(
-                new events.GettingResults({
-                  agr_id: agreement.id(),
-                  task_id: task_id,
-                })
-              );
-              await batch.post();
-              emit(
-                new events.ScriptFinished({
-                  agr_id: agreement.id(),
-                  task_id: task_id,
-                })
-              );
-              await accept_payment_for_agreement({
-                agreement_id: agreement.id(),
-                partial: true,
-              });
-            } catch (error) {
-              try {
-                // await command_generator.athrow(*sys.exc_info())
-              } catch (error) {
+                await batch.post();
                 emit(
-                  new events.WorkerFinished({
+                  new events.ScriptFinished({
                     agr_id: agreement.id(),
-                    exception: [error],
+                    task_id: task_id,
                   })
                 );
-                return;
+                await accept_payment_for_agreement({
+                  agreement_id: agreement.id(),
+                  partial: true,
+                });
+              } catch (error) {
+                try {
+                  await command_generator.throw(error)
+                } catch (error) {
+                  emit(
+                    new events.WorkerFinished({
+                      agr_id: agreement.id(),
+                      exception: [error],
+                    })
+                  );
+                  return;
+                }
               }
             }
-          }
+          });
           await accept_payment_for_agreement({
             agreement_id: agreement.id(),
             partial: false,
@@ -757,19 +763,21 @@ export class Engine {
   }
 
   _get_common_payment_platforms(proposal: OfferProposal): string[] {
-    let prov_platforms = Object.keys(proposal.props()).filter((prop) => {
-      return prop.startsWith("golem.com.payment.platform.")
-    }).map((prop) => {
-      return prop.split(".")[4];
-    });
+    let prov_platforms = Object.keys(proposal.props())
+      .filter((prop) => {
+        return prop.startsWith("golem.com.payment.platform.");
+      })
+      .map((prop) => {
+        return prop.split(".")[4];
+      });
     if (!prov_platforms) {
       prov_platforms = ["NGNT"];
     }
     const req_platforms = this._budget_allocations.map(
       (budget_allocation) => budget_allocation.payment_platform
     );
-    return req_platforms.filter((value) =>
-      value && prov_platforms.includes(value)
+    return req_platforms.filter(
+      (value) => value && prov_platforms.includes(value)
     ) as string[];
   }
 
diff --git a/yajsapi/runner/smartq.ts b/yajsapi/runner/smartq.ts
index a087cad2a..b103f7312 100644
--- a/yajsapi/runner/smartq.ts
+++ b/yajsapi/runner/smartq.ts
@@ -153,12 +153,12 @@ export class Consumer<Item> {
     this._fetched = null;
   }
 
-  __enter__(): Consumer<Item> {
+  ready(): Consumer<Item> {
     return this;
   }
 
-  __exit__() {
-    eventLoop().create_task(this._queue.reschedule_all(this));
+  done() {
+    eventLoop().create_task(this._queue.reschedule_all.bind(this._queue, this));
     return null;
   }
 
diff --git a/yajsapi/runner/task.ts b/yajsapi/runner/task.ts
index 6e894ea51..415ea3d4f 100644
--- a/yajsapi/runner/task.ts
+++ b/yajsapi/runner/task.ts
@@ -91,18 +91,24 @@ export class Task<TaskData, TaskResult> {
 
   accept_task(result: TaskResult | null = null): void {
     if (this._emit_event) {
-      this._emit_event("task", "accept", null, result);
+      this._emit_event(new events.TaskAccepted({task_id: this.id, result}));
     }
     if (this._status != TaskStatus.RUNNING) throw "Accepted task not running";
     this._status = TaskStatus.ACCEPTED;
     this._result = result;
     this._stop();
-    for (let cb of this._callbacks) cb && cb(this, "accept");
+    for (let cb of this._callbacks) cb && cb(this, TaskStatus.ACCEPTED);
   }
 
-  reject_task(): void {
-    if (this._status != TaskStatus.RUNNING) throw "";
+  reject_task(reason: string | null = null, retry: boolean = false): void {
+    if (this._emit_event) {
+      this._emit_event(new events.TaskRejected({task_id: this.id, reason}));
+    }
+    if (this._status != TaskStatus.RUNNING) throw "Rejected task not running";
     this._status = TaskStatus.REJECTED;
+    this._stop(retry)
+
+    for (let cb of this._callbacks) cb && cb(self, TaskStatus.REJECTED)
   }
 
   static get counter(): number {
diff --git a/yajsapi/utils/asyncWith.ts b/yajsapi/utils/asyncWith.ts
index f3d93bddb..f23ff4718 100644
--- a/yajsapi/utils/asyncWith.ts
+++ b/yajsapi/utils/asyncWith.ts
@@ -1,6 +1,6 @@
 import { logger } from "./";
 export default async function asyncWith(expression, block) {
-  let mgr = expression ? await expression.ready() : null;
+  let mgr = expression ? await expression.ready.call(expression) : null;
   try {
     await block(mgr);
   } catch (error) {
@@ -8,5 +8,5 @@ export default async function asyncWith(expression, block) {
     console.log();
     logger.error(`${message}\n\n${stack}\n`);
   }
-  await expression.done(mgr);
+  await expression.done.call(expression, mgr);
 }
diff --git a/yajsapi/utils/log.ts b/yajsapi/utils/log.ts
index 3669f8201..05360e54d 100644
--- a/yajsapi/utils/log.ts
+++ b/yajsapi/utils/log.ts
@@ -188,8 +188,7 @@ class SummaryLogger {
       else
         msg = `${
           event["num_offers"]
-        } offers have been collected from the market, but
-             no provider has responded for ${this.time_waiting_for_proposals.asSeconds()}s. `;
+        } offers have been collected from the market, but no provider has responded for ${this.time_waiting_for_proposals.asSeconds()}s. `;
       msg +=
         "Make sure you're using the latest released versions of yagna and yajsapi, and the correct subnet.";
       logger.warn(msg);
@@ -223,7 +222,7 @@ class SummaryLogger {
       if (event["success"]) return;
       const provider_name = this.agreement_provider_name[event["agr_id"]];
       logger.warn(
-        `Command failed on provider '${provider_name}', command: ${event["command"]}, output: ${event["message"]}`
+        `Command failed on provider '${provider_name}', command: ${JSON.stringify(event["command"])}, output: ${event["message"]}`
       );
     } else if (eventName === events.ScriptFinished.name) {
       const provider_name = this.agreement_provider_name[event["agr_id"]];
@@ -309,9 +308,9 @@ function isSuperset(set: Set<any>, subset: Set<any>) {
   return true;
 }
 
-export const changeLogLevel = ((level: string) => {
-    options.level = level;
-    logger.configure(options);
-});
+export const changeLogLevel = (level: string) => {
+  options.level = level;
+  logger.configure(options);
+};
 
 export default logger;