diff --git a/CHANGELOG.md b/CHANGELOG.md
index 622617b2..3a0cdfad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -98,6 +98,8 @@
 * "Too large" values for `scrollback.lines` causing an integer
   overflow, resulting in either visual glitches, crashes, or both
   ([#1828][1828]).
+* Crash when trying to set an invalid cursor shape with OSC-22, when
+  foot uses server-side cursor shapes.
 
 [1828]: https://codeberg.org/dnkl/foot/issues/1828
 
diff --git a/render.c b/render.c
index 3d1ce4ee..20c0490b 100644
--- a/render.c
+++ b/render.c
@@ -4722,6 +4722,8 @@ render_xcursor_is_valid(const struct seat *seat, const char *cursor)
 {
     if (cursor == NULL)
         return false;
+    if (seat->pointer.theme == NULL)
+        return false;
     return wl_cursor_theme_get_cursor(seat->pointer.theme, cursor) != NULL;
 }