diff --git a/CHANGELOG.md b/CHANGELOG.md
index f022ef0e7..ae753b98b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # HDMF Changelog
 
+## HDMF 3.14.2 (???)
+
+### Bug fixes
+- Fix iterator increment causing an extra +1 added after the end of completion. @CodyCBakerPhD [#1128](https://github.com/hdmf-dev/hdmf/pull/1128)
+
+
+
 ## HDMF 3.14.1 (June 6, 2024)
 
 ### Bug fixes
diff --git a/src/hdmf/data_utils.py b/src/hdmf/data_utils.py
index c03665caa..f4ac6541f 100644
--- a/src/hdmf/data_utils.py
+++ b/src/hdmf/data_utils.py
@@ -386,14 +386,18 @@ def __next__(self):
         :returns: DataChunk object with the data and selection of the current buffer.
         :rtype: DataChunk
         """
-        if self.display_progress:
-            self.progress_bar.update(n=1)
         try:
             buffer_selection = next(self.buffer_selection_generator)
+
+            # Only update after successful iteration
+            if self.display_progress:
+                self.progress_bar.update(n=1)
+
             return DataChunk(data=self._get_data(selection=buffer_selection), selection=buffer_selection)
         except StopIteration:
+            # Allow text to be written to new lines after completion
             if self.display_progress:
-                self.progress_bar.write("\n")  # Allows text to be written to new lines after completion
+                self.progress_bar.write("\n")
             raise StopIteration
 
     def __reduce__(self) -> Tuple[Callable, Iterable]: