diff --git a/novelwriter/extensions/modified.py b/novelwriter/extensions/modified.py
index 4eb50cff..8c49e6dd 100644
--- a/novelwriter/extensions/modified.py
+++ b/novelwriter/extensions/modified.py
@@ -27,11 +27,23 @@ from __future__ import annotations
 
 from PyQt5.QtCore import QSize, Qt
 from PyQt5.QtGui import QWheelEvent
-from PyQt5.QtWidgets import QComboBox, QDoubleSpinBox, QSpinBox, QToolButton, QWidget
+from PyQt5.QtWidgets import QComboBox, QDialog, QDoubleSpinBox, QSpinBox, QToolButton, QWidget
 
 from novelwriter import SHARED
 
 
+class NDialog(QDialog):
+
+    def softDelete(self) -> None:
+        """Since calling deleteLater is sometimes not safe from Python,
+        as the C++ object can be deleted before the Python process is
+        done with the object, we instead set the dialog's parent to None
+        so that it gets garbage collected when it runs out of scope.
+        """
+        self.setParent(None)  # type: ignore
+        return
+
+
 class NComboBox(QComboBox):
 
     def __init__(self, parent: QWidget | None = None) -> None:
diff --git a/novelwriter/tools/manuscript.py b/novelwriter/tools/manuscript.py
index 12ca8212..0d32457d 100644
--- a/novelwriter/tools/manuscript.py
+++ b/novelwriter/tools/manuscript.py
@@ -34,10 +34,10 @@ from PyQt5.QtCore import Qt, QTimer, QUrl, pyqtSignal, pyqtSlot
 from PyQt5.QtGui import QCloseEvent, QColor, QCursor, QPalette, QResizeEvent
 from PyQt5.QtPrintSupport import QPrinter, QPrintPreviewDialog
 from PyQt5.QtWidgets import (
-    QAbstractItemView, QApplication, QDialog, QFormLayout, QGridLayout,
-    QHBoxLayout, QLabel, QListWidget, QListWidgetItem, QPushButton,
-    QSizePolicy, QSplitter, QStackedWidget, QTabWidget, QTextBrowser,
-    QTreeWidget, QTreeWidgetItem, QVBoxLayout, QWidget
+    QAbstractItemView, QApplication, QFormLayout, QGridLayout, QHBoxLayout,
+    QLabel, QListWidget, QListWidgetItem, QPushButton, QSizePolicy, QSplitter,
+    QStackedWidget, QTabWidget, QTextBrowser, QTreeWidget, QTreeWidgetItem,
+    QVBoxLayout, QWidget
 )
 
 from novelwriter import CONFIG, SHARED
@@ -48,7 +48,7 @@ from novelwriter.core.tohtml import ToHtml
 from novelwriter.core.tokenizer import HeadingFormatter
 from novelwriter.error import logException
 from novelwriter.extensions.circularprogress import NProgressCircle
-from novelwriter.extensions.modified import NIconToggleButton, NIconToolButton
+from novelwriter.extensions.modified import NDialog, NIconToggleButton, NIconToolButton
 from novelwriter.gui.theme import STYLES_FLAT_TABS, STYLES_MIN_TOOLBUTTON
 from novelwriter.tools.manusbuild import GuiManuscriptBuild
 from novelwriter.tools.manussettings import GuiBuildSettings
@@ -63,7 +63,7 @@ if TYPE_CHECKING:  # pragma: no cover
 logger = logging.getLogger(__name__)
 
 
-class GuiManuscript(QDialog):
+class GuiManuscript(NDialog):
     """GUI Tools: Manuscript Tool
 
     The dialog displays all the users build definitions, a preview panel
@@ -285,7 +285,7 @@ class GuiManuscript(QDialog):
             if isinstance(obj, GuiBuildSettings) and obj.isVisible():
                 obj.close()
         event.accept()
-        self.deleteLater()
+        self.softDelete()
         return
 
     ##
diff --git a/novelwriter/tools/manussettings.py b/novelwriter/tools/manussettings.py
index a27c011f..a36a7c44 100644
--- a/novelwriter/tools/manussettings.py
+++ b/novelwriter/tools/manussettings.py
@@ -30,8 +30,8 @@ from typing import TYPE_CHECKING
 from PyQt5.QtCore import QEvent, Qt, pyqtSignal, pyqtSlot
 from PyQt5.QtGui import QFont, QIcon, QSyntaxHighlighter, QTextCharFormat, QTextDocument
 from PyQt5.QtWidgets import (
-    QAbstractButton, QAbstractItemView, QDialog, QDialogButtonBox, QFontDialog,
-    QFrame, QGridLayout, QHBoxLayout, QHeaderView, QLabel, QLineEdit, QMenu,
+    QAbstractButton, QAbstractItemView, QDialogButtonBox, QFontDialog, QFrame,
+    QGridLayout, QHBoxLayout, QHeaderView, QLabel, QLineEdit, QMenu,
     QPlainTextEdit, QPushButton, QSplitter, QStackedWidget, QTreeWidget,
     QTreeWidgetItem, QVBoxLayout, QWidget
 )
@@ -42,7 +42,9 @@ from novelwriter.core.buildsettings import BuildSettings, FilterMode
 from novelwriter.extensions.configlayout import (
     NColourLabel, NFixedPage, NScrollableForm, NScrollablePage
 )
-from novelwriter.extensions.modified import NComboBox, NDoubleSpinBox, NIconToolButton, NSpinBox
+from novelwriter.extensions.modified import (
+    NComboBox, NDialog, NDoubleSpinBox, NIconToolButton, NSpinBox
+)
 from novelwriter.extensions.pagedsidebar import NPagedSideBar
 from novelwriter.extensions.switch import NSwitch
 from novelwriter.extensions.switchbox import NSwitchBox
@@ -57,7 +59,7 @@ if TYPE_CHECKING:  # pragma: no cover
 logger = logging.getLogger(__name__)
 
 
-class GuiBuildSettings(QDialog):
+class GuiBuildSettings(NDialog):
     """GUI Tools: Manuscript Build Settings Dialog
 
     The main tool for configuring manuscript builds. It's a GUI tool for
@@ -199,7 +201,7 @@ class GuiBuildSettings(QDialog):
         self._askToSaveBuild()
         self._saveSettings()
         event.accept()
-        self.deleteLater()
+        self.softDelete()
         return
 
     ##