diff --git a/ANAConversationStudio/Helpers/Utilities.cs b/ANAConversationStudio/Helpers/Utilities.cs
index b7c2198..c3eaeab 100644
--- a/ANAConversationStudio/Helpers/Utilities.cs
+++ b/ANAConversationStudio/Helpers/Utilities.cs
@@ -315,6 +315,7 @@ public static Models.ChatFlowSearchItem SearchNode(this ChatNode node, string se
         }
         public static bool IsMatch(this string text, string searchKeywords)
         {
+            if (string.IsNullOrWhiteSpace(text) || string.IsNullOrWhiteSpace(searchKeywords)) return false;
             return Regex.IsMatch(text,
                 string.Join("|", searchKeywords.Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries)
                     .Select(x => x.Trim())), RegexOptions.IgnoreCase);
diff --git a/ANAConversationStudio/ViewModels/MainWindowViewModel.cs b/ANAConversationStudio/ViewModels/MainWindowViewModel.cs
index d6f88ad..ab58844 100644
--- a/ANAConversationStudio/ViewModels/MainWindowViewModel.cs
+++ b/ANAConversationStudio/ViewModels/MainWindowViewModel.cs
@@ -546,6 +546,7 @@ public ObservableCollection<ChatFlowSearchItem> SearchResults
 
         public void SearchInNodes(string keywords)
         {
+            if (string.IsNullOrWhiteSpace(keywords)) return;
             SearchResults = new ObservableCollection<ChatFlowSearchItem>(Network.Nodes.Select(node => node.ChatNode.SearchNode(keywords)).Where(x => x != null));
             if (SearchResults.Count == 0)
                 SearchResults = new ObservableCollection<ChatFlowSearchItem>