diff --git a/R/app.R b/R/app.R
index 74b232d8..df2e3821 100644
--- a/R/app.R
+++ b/R/app.R
@@ -161,20 +161,28 @@ app <- function() {
 
   entrypoint <- read_config()$legacy_entrypoint
   if (identical(entrypoint, "app_dir")) {
-    return(shiny::shinyAppDir("app"))
-  }
-
-  if (identical(entrypoint, "source")) {
+    shiny::shinyAppDir("app")
+  } else if (identical(entrypoint, "source")) {
     main <- new.env()
     source(fs::path("app", "main.R"), local = main)
-  } else {
+    shiny::shinyApp(
+      ui = with_head_tags(main$ui),
+      server = main$server
+    )
+  } else if (identical(entrypoint, "box_top_level")) {
     main <- load_main_module()
-    if (!identical(entrypoint, "box_top_level")) {
-      main <- as_top_level(main)
-    }
+    shiny::shinyApp(
+      ui = with_head_tags(main$ui),
+      server = main$server
+    )
+  } else if (is.null(entrypoint)) {
+    main <- load_main_module()
+    main <- as_top_level(main)
+    shiny::shinyApp(
+      ui = with_head_tags(main$ui),
+      server = main$server
+    )
+  } else {
+    stop()
   }
-  shiny::shinyApp(
-    ui = with_head_tags(main$ui),
-    server = main$server
-  )
 }