diff --git a/plone/namedfile/scaling.py b/plone/namedfile/scaling.py
index 8f2c9c4..369b7bc 100644
--- a/plone/namedfile/scaling.py
+++ b/plone/namedfile/scaling.py
@@ -564,7 +564,10 @@ def modified(self, fieldname=None):
         if fieldname is not None:
             field = getattr(context, fieldname, None)
             modified = getattr(field, "modified", None)
-            date = DateTime(modified or context._p_mtime)
+            try:
+                date = DateTime(modified or context._p_mtime)
+            except:
+                date = DateTime(modified() or context._p_mtime)
         else:
             date = DateTime(context._p_mtime)
         return date.millis()
diff --git a/pyproject.toml b/pyproject.toml
deleted file mode 100644
index 03fe8fd..0000000
--- a/pyproject.toml
+++ /dev/null
@@ -1,35 +0,0 @@
-[tool.towncrier]
-filename = "CHANGES.rst"
-directory = "news/"
-title_format = "{version} ({project_date})"
-underlines = ["-", ""]
-
-[[tool.towncrier.type]]
-directory = "breaking"
-name = "Breaking changes:"
-showcontent = true
-
-[[tool.towncrier.type]]
-directory = "feature"
-name = "New features:"
-showcontent = true
-
-[[tool.towncrier.type]]
-directory = "bugfix"
-name = "Bug fixes:"
-showcontent = true
-
-[[tool.towncrier.type]]
-directory = "internal"
-name = "Internal:"
-showcontent = true
-
-[[tool.towncrier.type]]
-directory = "documentation"
-name = "Documentation:"
-showcontent = true
-
-[[tool.towncrier.type]]
-directory = "tests"
-name = "Tests"
-showcontent = true