diff --git a/src/Main/ICSharpCode.SharpDevelop.Dom/Project/Src/VBNet/VBNetExpressionFinder.cs b/src/Main/ICSharpCode.SharpDevelop.Dom/Project/Src/VBNet/VBNetExpressionFinder.cs
index 7dca52082a..35602701ed 100644
--- a/src/Main/ICSharpCode.SharpDevelop.Dom/Project/Src/VBNet/VBNetExpressionFinder.cs
+++ b/src/Main/ICSharpCode.SharpDevelop.Dom/Project/Src/VBNet/VBNetExpressionFinder.cs
@@ -26,7 +26,8 @@ namespace ICSharpCode.SharpDevelop.Dom.VBNet
 		
 		int LocationToOffset(Location location)
 		{
-			if (location.Line <= 0) return -1;
+			if (location.Line <= 0 || location.Line >= lineOffsets.Count)
+				return -1;
 			return lineOffsets[location.Line - 1] + location.Column - 1;
 		}