diff --git a/packages/core/src/editor/BlockNoteEditor.ts b/packages/core/src/editor/BlockNoteEditor.ts
index b1caec71b..aa8ffea6e 100644
--- a/packages/core/src/editor/BlockNoteEditor.ts
+++ b/packages/core/src/editor/BlockNoteEditor.ts
@@ -1502,6 +1502,9 @@ export class BlockNoteEditor<
     if (!raw) {
       htmlToPaste = this.convertHtmlToBlockNoteHtml(html);
     }
+    if (!htmlToPaste) {
+      return;
+    }
     this.prosemirrorView?.pasteHTML(htmlToPaste);
   }
 
diff --git a/packages/core/src/extensions/SuggestionMenu/SuggestionPlugin.ts b/packages/core/src/extensions/SuggestionMenu/SuggestionPlugin.ts
index 6564a1993..c21a8ddb5 100644
--- a/packages/core/src/extensions/SuggestionMenu/SuggestionPlugin.ts
+++ b/packages/core/src/extensions/SuggestionMenu/SuggestionPlugin.ts
@@ -86,7 +86,9 @@ class SuggestionMenuView<
     this.pluginState = stopped ? prev : next;
 
     if (stopped || !this.editor.isEditable) {
-      this.state!.show = false;
+      if (this.state) {
+        this.state.show = false;
+      }
       this.emitUpdate(this.pluginState!.triggerCharacter);
 
       return;
diff --git a/packages/react/src/components/Comments/ThreadsSidebar.tsx b/packages/react/src/components/Comments/ThreadsSidebar.tsx
index 443ebbf0e..5f6ba726d 100644
--- a/packages/react/src/components/Comments/ThreadsSidebar.tsx
+++ b/packages/react/src/components/Comments/ThreadsSidebar.tsx
@@ -44,7 +44,8 @@ const ThreadItem = React.memo(
         // If the focused element is within the action toolbar, we don't want to
         // blur the thread for UX reasons.
         if (
-          (event.relatedTarget as HTMLElement).closest(".bn-action-toolbar")
+          !event.relatedTarget ||
+          event.relatedTarget.closest(".bn-action-toolbar")
         ) {
           return;
         }