diff --git a/ClosedXML/Excel/XLWorkbook_Load.cs b/ClosedXML/Excel/XLWorkbook_Load.cs
index af014f2..76e20c5 100644
--- a/ClosedXML/Excel/XLWorkbook_Load.cs
+++ b/ClosedXML/Excel/XLWorkbook_Load.cs
@@ -629,6 +629,10 @@
                 foreach (var anchor in drawingsPart.WorksheetDrawing.ChildElements)
                 {
                     var imgId = GetImageRelIdFromAnchor(anchor);
+
+                    //If imgId is null, we're probably dealing with a TextBox (or another shape) instead of a picture
+                    if (imgId == null) continue;
+
                     var imagePart = drawingsPart.GetPartById(imgId);
                     using (var stream = imagePart.GetStream())
                     {