diff --git a/Zend/zend_operators.c b/Zend/zend_operators.c
index c54f4f0c2a22..a43fdcc9a48b 100644
--- a/Zend/zend_operators.c
+++ b/Zend/zend_operators.c
@@ -448,6 +448,7 @@ static zend_never_inline zend_long ZEND_FASTCALL zendi_try_get_long(const zval *
 				ZEND_ASSERT(Z_TYPE(dst) == IS_LONG);
 				return Z_LVAL(dst);
 			}
+		case IS_UNDEF:
 		case IS_RESOURCE:
 		case IS_ARRAY:
 			*failed = true;
diff --git a/ext/zlib/tests/gh22142.phpt b/ext/zlib/tests/gh22142.phpt
new file mode 100644
index 000000000000..84397a4e85a9
--- /dev/null
+++ b/ext/zlib/tests/gh22142.phpt
@@ -0,0 +1,20 @@
+--TEST--
+GH-22142 (Assertion failure in zendi_try_get_long() on IS_UNDEF)
+--EXTENSIONS--
+zlib
+--FILE--
+<?php
+
+class Options {
+    public int $level;
+}
+
+try {
+    deflate_init(ZLIB_ENCODING_DEFLATE, new Options());
+} catch (TypeError $e) {
+    echo $e->getMessage(), PHP_EOL;
+}
+
+?>
+--EXPECT--
+deflate_init(): Argument #2 ($options) the value for option "level" must be of type int, null given