diff --git a/src/components/flow/Flow.tsx b/src/components/flow/Flow.tsx
index b82aad3b5..f2e2a3d1b 100644
--- a/src/components/flow/Flow.tsx
+++ b/src/components/flow/Flow.tsx
@@ -16,7 +16,7 @@ import { bindActionCreators } from 'redux';
 import Plumber from 'services/Plumber';
 import { DragSelection, DebugState } from 'store/editor';
 import { RenderNode } from 'store/flowContext';
-import { createEmptyNode, detectLoops, getOrderedNodes } from 'store/helpers';
+import { createEmptyNode, detectLoops, fetchFlowActivity, getOrderedNodes } from 'store/helpers';
 import { NodeEditorSettings } from 'store/nodeEditor';
 import AppState from 'store/state';
 import {
@@ -180,6 +180,9 @@ export class Flow extends React.PureComponent<FlowStoreProps, {}> {
 
   public componentWillUnmount(): void {
     this.Plumber.reset();
+    if ((window as any).activityTimeout) {
+      clearTimeout((window as any).activityTimeout);
+    }
   }
 
   /**
diff --git a/src/store/helpers.ts b/src/store/helpers.ts
index d6cd68e0f..a8220766f 100644
--- a/src/store/helpers.ts
+++ b/src/store/helpers.ts
@@ -53,7 +53,7 @@ interface Reflow {
 }
 
 // track if we have an active timeout before issuing a new one
-let activityTimeout: any = null;
+(window as any).activityTimeout = null;
 
 export const getNodeWithAction = (nodes: RenderNodeMap, actionUUID: string): RenderNode => {
   for (const nodeUUID of Object.keys(nodes)) {
@@ -698,11 +698,11 @@ export const fetchFlowActivity = (
 
           dispatch(mergeEditorState(updates));
 
-          if (activityTimeout) {
-            window.clearTimeout(activityTimeout);
+          if ((window as any).activityTimeout) {
+            window.clearTimeout((window as any).activityTimeout);
           }
 
-          activityTimeout = window.setTimeout(() => {
+          (window as any).activityTimeout = window.setTimeout(() => {
             fetchFlowActivity(endpoint, dispatch, getState, uuid);
           }, activityInterval);
         }
@@ -711,11 +711,11 @@ export const fetchFlowActivity = (
         // failure fetching activity, if this happens we stop trying to fetch more
       });
   } else {
-    if (activityTimeout) {
-      window.clearTimeout(activityTimeout);
+    if ((window as any).activityTimeout) {
+      window.clearTimeout((window as any).activityTimeout);
     }
 
-    activityTimeout = window.setTimeout(() => {
+    (window as any).activityTimeout = window.setTimeout(() => {
       fetchFlowActivity(endpoint, dispatch, getState, uuid);
     }, 1000);
   }