diff --git a/lib/shared/thread-actions-utils.js b/lib/shared/thread-actions-utils.js
--- a/lib/shared/thread-actions-utils.js
+++ b/lib/shared/thread-actions-utils.js
@@ -126,47 +126,41 @@
       parentThreadID: threadInfo.parentThreadID,
       name: threadInfo.name,
     });
-  } else {
-    invariant(
-      otherMemberIDs.length > 0,
-      'otherMemberIDs should not be empty for threads',
+  } else if (threadTypeIsThick(threadInfo.type)) {
+    const type = assertThickThreadType(
+      pendingThreadType(otherMemberIDs.length, 'thick'),
     );
-    if (threadTypeIsThick(threadInfo.type)) {
-      const type = assertThickThreadType(
-        pendingThreadType(otherMemberIDs.length, 'thick'),
-      );
 
-      invariant(
-        type !== 16,
-        // Flow does not recognize that threadTypes.THICK_SIDEBAR is 16
-        'pendingThreadType should not return THICK_SIDEBAR',
-      );
-      newThreadID = await createNewThickThread({
-        type,
-        initialMemberIDs: otherMemberIDs,
-        color: threadInfo.color,
-      });
-      newThreadType = type;
-    } else {
-      const type = assertThinThreadType(
-        pendingThreadType(otherMemberIDs.length, 'thin'),
-      );
+    invariant(
+      type !== 16,
+      // Flow does not recognize that threadTypes.THICK_SIDEBAR is 16
+      'pendingThreadType should not return THICK_SIDEBAR',
+    );
+    newThreadID = await createNewThickThread({
+      type,
+      initialMemberIDs: otherMemberIDs,
+      color: threadInfo.color,
+    });
+    newThreadType = type;
+  } else {
+    const type = assertThinThreadType(
+      pendingThreadType(otherMemberIDs.length, 'thin'),
+    );
 
-      invariant(
-        type !== 5, // Flow does not recognize that threadTypes.SIDEBAR is 5
-        'pendingThreadType should not return SIDEBAR',
-      );
-      resultPromise = createNewThinThread({
-        type,
-        initialMemberIDs: otherMemberIDs,
-        color: threadInfo.color,
-        calendarQuery,
-      });
-      void dispatchActionPromise(newThreadActionTypes, resultPromise);
-      const result = await resultPromise;
-      newThreadID = result.newThreadID;
-      newThreadType = type;
-    }
+    invariant(
+      type !== 5, // Flow does not recognize that threadTypes.SIDEBAR is 5
+      'pendingThreadType should not return SIDEBAR',
+    );
+    resultPromise = createNewThinThread({
+      type,
+      initialMemberIDs: otherMemberIDs,
+      color: threadInfo.color,
+      calendarQuery,
+    });
+    void dispatchActionPromise(newThreadActionTypes, resultPromise);
+    const result = await resultPromise;
+    newThreadID = result.newThreadID;
+    newThreadType = type;
   }
   return {
     threadID: newThreadID,