diff --git a/Zend/tests/generators/yield_array_key.phpt b/Zend/tests/generators/yield_array_key.phpt
new file mode 100644
index 00000000000..5afba00de83
--- /dev/null
+++ b/Zend/tests/generators/yield_array_key.phpt
@@ -0,0 +1,18 @@
+--TEST--
+Array keys can be yielded from generators
+--FILE--
+<?php
+
+function gen() {
+    yield [] => 1;
+}
+
+$gen = gen();
+var_dump($gen->key());
+var_dump($gen->current());
+
+?>
+--EXPECT--
+array(0) {
+}
+int(1)
diff --git a/Zend/zend_vm_def.h b/Zend/zend_vm_def.h
index ffd81b03785..f683ff29727 100644
--- a/Zend/zend_vm_def.h
+++ b/Zend/zend_vm_def.h
@@ -5511,7 +5511,7 @@ ZEND_VM_HANDLER(160, ZEND_YIELD, CONST|TMP|VAR|CV|UNUSED, CONST|TMP|VAR|CV|UNUSE
 			INIT_PZVAL_COPY(copy, key);
 
 			/* Temporary variables don't need ctor copying */
-			if (!IS_OP1_TMP_FREE()) {
+			if (!IS_OP2_TMP_FREE()) {
 				zval_copy_ctor(copy);
 			}
 
diff --git a/Zend/zend_vm_execute.h b/Zend/zend_vm_execute.h
index b0e05b1296a..f8a89050400 100644
--- a/Zend/zend_vm_execute.h
+++ b/Zend/zend_vm_execute.h
@@ -5005,7 +5005,7 @@ static int ZEND_FASTCALL  ZEND_YIELD_SPEC_CONST_TMP_HANDLER(ZEND_OPCODE_HANDLER_
 			INIT_PZVAL_COPY(copy, key);
 
 			/* Temporary variables don't need ctor copying */
-			if (!0) {
+			if (!1) {
 				zval_copy_ctor(copy);
 			}
 
@@ -9553,7 +9553,7 @@ static int ZEND_FASTCALL  ZEND_YIELD_SPEC_TMP_CONST_HANDLER(ZEND_OPCODE_HANDLER_
 			INIT_PZVAL_COPY(copy, key);
 
 			/* Temporary variables don't need ctor copying */
-			if (!1) {
+			if (!0) {
 				zval_copy_ctor(copy);
 			}
 
@@ -11266,7 +11266,7 @@ static int ZEND_FASTCALL  ZEND_YIELD_SPEC_TMP_VAR_HANDLER(ZEND_OPCODE_HANDLER_AR
 			INIT_PZVAL_COPY(copy, key);
 
 			/* Temporary variables don't need ctor copying */
-			if (!1) {
+			if (!0) {
 				zval_copy_ctor(copy);
 			}
 
@@ -11846,7 +11846,7 @@ static int ZEND_FASTCALL  ZEND_YIELD_SPEC_TMP_UNUSED_HANDLER(ZEND_OPCODE_HANDLER
 			INIT_PZVAL_COPY(copy, key);
 
 			/* Temporary variables don't need ctor copying */
-			if (!1) {
+			if (!0) {
 				zval_copy_ctor(copy);
 			}
 
@@ -12537,7 +12537,7 @@ static int ZEND_FASTCALL  ZEND_YIELD_SPEC_TMP_CV_HANDLER(ZEND_OPCODE_HANDLER_ARG
 			INIT_PZVAL_COPY(copy, key);
 
 			/* Temporary variables don't need ctor copying */
-			if (!1) {
+			if (!0) {
 				zval_copy_ctor(copy);
 			}
 
@@ -18543,7 +18543,7 @@ static int ZEND_FASTCALL  ZEND_YIELD_SPEC_VAR_TMP_HANDLER(ZEND_OPCODE_HANDLER_AR
 			INIT_PZVAL_COPY(copy, key);
 
 			/* Temporary variables don't need ctor copying */
-			if (!0) {
+			if (!1) {
 				zval_copy_ctor(copy);
 			}
 
@@ -27081,7 +27081,7 @@ static int ZEND_FASTCALL  ZEND_YIELD_SPEC_UNUSED_TMP_HANDLER(ZEND_OPCODE_HANDLER
 			INIT_PZVAL_COPY(copy, key);
 
 			/* Temporary variables don't need ctor copying */
-			if (!0) {
+			if (!1) {
 				zval_copy_ctor(copy);
 			}
 
@@ -35600,7 +35600,7 @@ static int ZEND_FASTCALL  ZEND_YIELD_SPEC_CV_TMP_HANDLER(ZEND_OPCODE_HANDLER_ARG
 			INIT_PZVAL_COPY(copy, key);
 
 			/* Temporary variables don't need ctor copying */
-			if (!0) {
+			if (!1) {
 				zval_copy_ctor(copy);
 			}