diff --git a/src/calibre/gui2/tweak_book/editor/syntax/base.py b/src/calibre/gui2/tweak_book/editor/syntax/base.py
index 60c544083a..da01e1db20 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/base.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/base.py
@@ -66,5 +66,6 @@ class SyntaxHighlighter(QSyntaxHighlighter):
             import traceback
             traceback.print_exc()
         finally:
-            QApplication.processEvents()  # Try to keep the editor responsive to user input
+            # Disabled as it causes crashes
+            pass  # QApplication.processEvents()  # Try to keep the editor responsive to user input