Do not allow adding tasks while in the middle of flushing a message queue

1 files changed, 5 insertions, 0 deletions

diff --git a/editor/progress_dialog.cpp b/editor/progress_dialog.cpp
index d2378f33ed..5fdc725f50 100644
--- a/editor/progress_dialog.cpp
+++ b/editor/progress_dialog.cpp
@@ -166,6 +166,11 @@ void ProgressDialog::_popup() {
 
 void ProgressDialog::add_task(const String &p_task, const String &p_label, int p_steps, bool p_can_cancel) {
 
+	if (MessageQueue::get_singleton()->is_flushing()) {
+		ERR_PRINT("Do not use progress dialog (task) while flushing the message queue or using call_deferred()!");
+		return;
+	}
+
 	ERR_FAIL_COND(tasks.has(p_task));
 	ProgressDialog::Task t;
 	t.vb = memnew(VBoxContainer);