Working on multiple UI roots

Added a menu for changing the split mode.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/ui/documentwidget.c b/src/ui/documentwidget.c
index 21c0aa23..410b793e 100644
--- a/src/ui/documentwidget.c
+++ b/src/ui/documentwidget.c
@@ -3969,6 +3969,11 @@ static iBool render_DocumentWidget_(const iDocumentWidget *d, iDrawContext *ctx,
 }
 
 static void prerender_DocumentWidget_(iAny *context) {
+    if (current_Root() == NULL) {
+        /* The widget has probably been removed from the widget tree, pending destruction.
+           Tickers are not cancelled until the widget is actually destroyed. */
+        return;
+    }
     const iDocumentWidget *d = context;
     iDrawContext ctx = {
         .widget          = d,