diff --git a/IncludeToolboxShared/Util/ParseIncludes.cs b/IncludeToolboxShared/Util/ParseIncludes.cs
index 27473a7..724bedc 100644
--- a/IncludeToolboxShared/Util/ParseIncludes.cs
+++ b/IncludeToolboxShared/Util/ParseIncludes.cs
@@ -17,6 +17,7 @@ public static partial class Parser
 
         public static IncludeLine[] ParseInclues(ReadOnlySpan<char> text, bool ignore_ifdefs = true)
         {
+            if (text.IsEmpty) return new IncludeLine[0];
             List<IncludeLine> lines = new();
             Lexer.Context lctx = new(text);
 
diff --git a/IncludeToolboxShared/Util/Utils.cs b/IncludeToolboxShared/Util/Utils.cs
index 3667be8..6d931f5 100644
--- a/IncludeToolboxShared/Util/Utils.cs
+++ b/IncludeToolboxShared/Util/Utils.cs
@@ -32,6 +32,7 @@ public static ReadOnlySpan<char> GetIncludeSpanRO(string text)
         {
             int[] line = new int[2];
             line[0] = text.IndexOf("#include"); //first
+            if (line[0] == -1) return new ReadOnlySpan<char>();
             line[1] = text.IndexOf("\n", text.LastIndexOf("#include")) - line[0] + 1; //last
             return text.AsSpan(line[0], line[1]);
         }