diff --git a/test/regression/4750-crash-on-append-empty-output-at-end-of-buffer/cmd b/test/regression/4750-crash-on-append-empty-output-at-end-of-buffer/cmd
new file mode 100644
index 00000000..519ebf40
--- /dev/null
+++ b/test/regression/4750-crash-on-append-empty-output-at-end-of-buffer/cmd
@@ -0,0 +1 @@
+<a-!>true<ret>
diff --git a/test/regression/4750-crash-on-append-empty-output-at-end-of-buffer/in b/test/regression/4750-crash-on-append-empty-output-at-end-of-buffer/in
new file mode 100644
index 00000000..8b137891
--- /dev/null
+++ b/test/regression/4750-crash-on-append-empty-output-at-end-of-buffer/in
@@ -0,0 +1 @@
+