diff --git a/ext/opcache/jit/zend_jit_arm64.dasc b/ext/opcache/jit/zend_jit_arm64.dasc
index d25d82c779d..967ba0e5d14 100644
--- a/ext/opcache/jit/zend_jit_arm64.dasc
+++ b/ext/opcache/jit/zend_jit_arm64.dasc
@@ -5461,6 +5461,7 @@ static int zend_jit_simple_assign(dasm_State    **Dst,
 			ZEND_ASSERT(Z_MODE(val_addr) == IS_MEM_ZVAL && Z_REG(val_addr) == ZREG_FP);
 			|	LOAD_32BIT_VAL FCARG1w, Z_OFFSET(val_addr)
 			|	EXT_CALL zend_jit_undefined_op_helper, REG0
+			|	cbz RETVALx, ->exception_handler_undef
 			if (save_r1) {
 				|	ldr FCARG1x, T1	// restore
 			}
diff --git a/ext/opcache/jit/zend_jit_x86.dasc b/ext/opcache/jit/zend_jit_x86.dasc
index f1b9ab99b04..a08f26ca8eb 100644
--- a/ext/opcache/jit/zend_jit_x86.dasc
+++ b/ext/opcache/jit/zend_jit_x86.dasc
@@ -5949,6 +5949,8 @@ static int zend_jit_simple_assign(dasm_State    **Dst,
 			ZEND_ASSERT(Z_MODE(val_addr) == IS_MEM_ZVAL && Z_REG(val_addr) == ZREG_FP);
 			|	mov FCARG1d, Z_OFFSET(val_addr)
 			|	EXT_CALL zend_jit_undefined_op_helper, r0
+			|	test r0, r0
+			|	jz ->exception_handler_undef
 			if (save_r1) {
 				|	mov FCARG1a, aword T1 // restore
 			}
diff --git a/ext/opcache/tests/jit/assign_043.phpt b/ext/opcache/tests/jit/assign_043.phpt
new file mode 100644
index 00000000000..5931ec4709a
--- /dev/null
+++ b/ext/opcache/tests/jit/assign_043.phpt
@@ -0,0 +1,22 @@
+--TEST--
+JIT ASSIGN: Undef var notice promoted to exception
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.file_update_protection=0
+opcache.jit_buffer_size=1M
+opcache.protect_memory=1
+--FILE--
+<?php
+set_error_handler(function($_, $m) {
+    throw new Exception($m);
+});
+try {
+    $a = $b;
+    NOT_REACHED;
+} catch (Exception $e) {
+    echo $e->getMessage(), "\n";
+}
+?>
+--EXPECT--
+Undefined variable $b