diff --git a/ext/opcache/jit/zend_jit_helpers.c b/ext/opcache/jit/zend_jit_helpers.c
index 5f435e328e0..f39d05c852f 100644
--- a/ext/opcache/jit/zend_jit_helpers.c
+++ b/ext/opcache/jit/zend_jit_helpers.c
@@ -1587,7 +1587,9 @@ static void ZEND_FASTCALL zend_jit_assign_dim_op_helper(zval *container, zval *d
 			}
 			zval_ptr_dtor(&res);
 		} else {
-			zend_error(E_WARNING, "Attempt to assign property of non-object");
+			/* Exception is thrown in this case */
+			GC_DELREF(obj);
+			return;
 		}
 		if (UNEXPECTED(GC_DELREF(obj) == 0)) {
 			zend_objects_store_del(obj);
diff --git a/ext/opcache/tests/jit/gh12723-B.phpt b/ext/opcache/tests/jit/gh12723-B.phpt
new file mode 100644
index 00000000000..9f5ae7a19ff
--- /dev/null
+++ b/ext/opcache/tests/jit/gh12723-B.phpt
@@ -0,0 +1,19 @@
+--TEST--
+GH-12723: JIT emits "Attempt to assign property of non-object" warning at the same time as Error is being thrown
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+--FILE--
+<?php
+
+$container = new stdClass();
+
+try {
+    $container[new stdClass()] .= 'append';
+} catch (\Throwable $e) {
+    echo $e->getMessage(), "\n";
+}
+
+?>
+--EXPECT--
+Cannot use object of type stdClass as array