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-rw-r--r--Zend/zend_execute_API.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/Zend/zend_execute_API.c b/Zend/zend_execute_API.c
index 88662d3b1e..7bcd211e96 100644
--- a/Zend/zend_execute_API.c
+++ b/Zend/zend_execute_API.c
@@ -225,6 +225,9 @@ ZEND_API inline int i_zend_is_true(zval *op)
int result;
switch (op->type) {
+ case IS_UNSET:
+ result = 0;
+ break;
case IS_LONG:
case IS_BOOL:
case IS_RESOURCE: