fix: crash when select a new conversation

Change-Id: Id835d574eaa54139f3b02b26bf6f47510da0dac3
diff --git a/src/MessagesVC.mm b/src/MessagesVC.mm
index 32a2831..20f445c 100644
--- a/src/MessagesVC.mm
+++ b/src/MessagesVC.mm
@@ -535,6 +535,9 @@
     auto size = conv->interactions.size();
 
     if (row == size) {
+        if (size < 1) {
+            return [[NSView alloc] init];
+        }
         //last row peer composing view
         result = [tableView makeViewWithIdentifier:@"PeerComposingMsgView" owner:conversationView];
         std::advance(it, row-1);