diff --git a/lib/components/farcaster-data-handler.react.js b/lib/components/farcaster-data-handler.react.js
--- a/lib/components/farcaster-data-handler.react.js
+++ b/lib/components/farcaster-data-handler.react.js
@@ -63,6 +63,15 @@
 
   const prevCanQueryRef = React.useRef<?boolean>();
 
+  // It's possible for the user to log out while handleFarcasterMutuals below
+  // is running. It's not a big deal, but this can lead to a useless server call
+  // at the end. To avoid that useless server call, we want to check whether the
+  // user is logged in beforehand, but the value of loggedIn bound in the
+  // callback will be outdated. Instead, we can check this ref, which will be
+  // updated on every render.
+  const loggedInRef = React.useRef(loggedIn);
+  loggedInRef.current = loggedIn;
+
   const handleFarcasterMutuals = React.useCallback(async () => {
     const canQuery = isActive && !!fid && loggedIn;
     if (canQuery === prevCanQueryRef.current) {
@@ -100,6 +109,10 @@
       [(currentUserID: string)]: fid,
     };
 
+    if (!loggedInRef.current) {
+      return;
+    }
+
     void dispatchActionPromise(
       updateRelationshipsActionTypes,
       createThreadsAndRobotextForFarcasterMutuals(