diff --git a/scene/resources/sky.cpp b/scene/resources/sky.cpp
index cae5e54e050..75b8b0e1f58 100644
--- a/scene/resources/sky.cpp
+++ b/scene/resources/sky.cpp
@@ -390,6 +390,8 @@ void ProceduralSky::_queue_update() {
 }
 
 void ProceduralSky::_thread_done(const Ref<Image> &p_image) {
+	ERR_FAIL_COND(p_image.is_null());
+
 	panorama = p_image;
 	VS::get_singleton()->texture_allocate(texture, panorama->get_width(), panorama->get_height(), 0, Image::FORMAT_RGBE9995, VS::TEXTURE_TYPE_2D, VS::TEXTURE_FLAG_FILTER | VS::TEXTURE_FLAG_REPEAT);
 	VS::get_singleton()->texture_set_data(texture, panorama);