diff --git a/NEWS b/NEWS
index 14c77d022e3..e79cffed237 100644
--- a/NEWS
+++ b/NEWS
@@ -6,6 +6,8 @@ PHP                                                                        NEWS
   . Fixed bug #60833 (self, parent, static behave inconsistently 
     case-sensitive). (Stas, mario at include-once dot org)
   . Implemented FR #60524 (specify temp dir by php.ini). (ALeX Kazik).
+  . Fixed bug #63830 (Segfault on undefined function call in nested generator).
+    (Nikita Popov)
 
 - CLI server:
   . Fixed bug #64128 (buit-in web server is broken on ppc64). (Remi)
diff --git a/Zend/tests/generators/nested_calls_with_die.phpt b/Zend/tests/generators/nested_calls_with_die.phpt
new file mode 100644
index 00000000000..f43d89ba219
--- /dev/null
+++ b/Zend/tests/generators/nested_calls_with_die.phpt
@@ -0,0 +1,30 @@
+--TEST--
+Test nested calls with die() in a generator
+--FILE--
+<?php
+
+function gen() {
+    die('Test');
+    yield; // force generator
+}
+
+function function_with_3_args() {
+    $gen = gen();
+    $gen->rewind();
+}
+
+function function_with_4_args() {
+    function_with_3_args(4, 5, 6);
+}
+
+function outerGen() {
+    function_with_4_args(0, 1, 2, 3);
+    yield; // force generator
+}
+
+$outerGen = outerGen();
+$outerGen->rewind();
+
+?>
+--EXPECT--
+Test
diff --git a/Zend/zend_generators.c b/Zend/zend_generators.c
index 621320614ca..c1dbee124f3 100644
--- a/Zend/zend_generators.c
+++ b/Zend/zend_generators.c
@@ -94,10 +94,16 @@ ZEND_API void zend_generator_close(zend_generator *generator, zend_bool finished
 
 		/* Clear any backed up stack arguments */
 		if (generator->stack != EG(argument_stack)) {
-			void **stack_frame = zend_vm_stack_frame_base(execute_data);
-			while (generator->stack->top != stack_frame) {
-				zval_ptr_dtor((zval**)stack_frame);
-				stack_frame++;
+			void **ptr = generator->stack->top - 1;
+			void **end = zend_vm_stack_frame_base(execute_data);
+
+			/* If the top stack element is the argument count, skip it */
+			if (execute_data->function_state.arguments) {
+				ptr--;
+			}
+
+			for (; ptr >= end; --ptr) {
+				zval_ptr_dtor((zval**) ptr);
 			}
 		}