From fc77f983cb92e21f82e1f12c338e861dadcfa72f Mon Sep 17 00:00:00 2001
From: bruvzg <7645683+bruvzg@users.noreply.github.com>
Date: Mon, 6 Jun 2022 23:45:01 +0300
Subject: [RTL] Stop processing thread before deleting scroll bar.

---
 scene/gui/rich_text_label.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scene/gui/rich_text_label.cpp b/scene/gui/rich_text_label.cpp
index 0a35b8ecc8..cf7bf930a5 100644
--- a/scene/gui/rich_text_label.cpp
+++ b/scene/gui/rich_text_label.cpp
@@ -1613,6 +1613,7 @@ void RichTextLabel::_notification(int p_what) {
 			update();
 		} break;
 
+		case NOTIFICATION_PREDELETE:
 		case NOTIFICATION_EXIT_TREE: {
 			_stop_thread();
 		} break;
@@ -2555,6 +2556,10 @@ bool RichTextLabel::_validate_line_caches() {
 
 void RichTextLabel::_process_line_caches() {
 	// Shape invalid lines.
+	if (!is_inside_tree()) {
+		return;
+	}
+
 	MutexLock data_lock(data_mutex);
 	Rect2 text_rect = _get_text_rect();
 
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