Make puglRealize() always gracefully fail with a bad configuration

1 files changed, 5 insertions, 0 deletions

diff --git a/src/mac.m b/src/mac.m
index 2a54134..4f5c08f 100644
--- a/src/mac.m
+++ b/src/mac.m
@@ -1007,10 +1007,15 @@ PuglStatus
 puglRealize(PuglView* view)
 {
   PuglInternals* impl = view->impl;
+
   if (impl->wrapperView) {
     return PUGL_FAILURE;
   }
 
+  if (!view->backend || !view->backend->configure) {
+    return PUGL_BAD_BACKEND;
+  }
+
   const NSScreen* const screen      = [NSScreen mainScreen];
   const double          scaleFactor = [screen backingScaleFactor];