diff --git a/client/src/components/forms/PostFormCard.tsx b/client/src/components/forms/PostFormCard.tsx
index 9a6c44e..dfda473 100644
--- a/client/src/components/forms/PostFormCard.tsx
+++ b/client/src/components/forms/PostFormCard.tsx
@@ -122,6 +122,12 @@ const NewNoteCard = ({
     const { handleSubmit: originalHandleSubmit, doingWorkProp, hashrate, bestPow, signedPoWEvent } = useSubmitForm(unsigned, difficulty);
 
     const handleSubmit = async (event: React.FormEvent) => {
+        event.preventDefault(); // Prevent default form submission
+        
+        if (comment.trim() === "") {
+            return; // Don't submit if comment is empty or just whitespace
+        }
+
         // Check if tagType is 'Quote' and update comment
         if (tagType === 'Quote' && refEvent) {
             setComment(prevComment => prevComment + '\nnostr:' + nip19.noteEncode(refEvent.id));
diff --git a/client/src/hooks/processedEvents.ts b/client/src/hooks/processedEvents.ts
index 340254f..365af53 100644
--- a/client/src/hooks/processedEvents.ts
+++ b/client/src/hooks/processedEvents.ts
@@ -30,10 +30,22 @@ const useProcessedEvents = (id?: string, filterDifficulty: number = 0) => {
       });
     });
 
+    // Create a Set to keep track of seen pubkeys
+    const seenPubkeys = new Set<string>();
+
     return noteEvents
       .filter(event => {
         const pow = verifyPow(event);
-        return (event.kind === 0 || pow >= filterDifficulty) && !(event.kind === 1 && event.tags.some(tag => tag[0] === 'e'));
+        // Check if the pubkey has been seen before
+        if (seenPubkeys.has(event.pubkey)) {
+          return false;
+        }
+        // Add the pubkey to the set if it passes the filter
+        if ((event.kind === 0 || pow >= filterDifficulty) && !(event.kind === 1 && event.tags.some(tag => tag[0] === 'e'))) {
+          seenPubkeys.add(event.pubkey);
+          return true;
+        }
+        return false;
       })
       .map(event => {
         const pow = verifyPow(event); // Calculate once and reuse