diff --git a/ext/gmp/gmp.c b/ext/gmp/gmp.c
index 02eb30bacb730..9ada4996900a1 100644
--- a/ext/gmp/gmp.c
+++ b/ext/gmp/gmp.c
@@ -707,12 +707,22 @@ static inline void gmp_zval_binary_ui_op(zval *return_value, zval *a_arg, zval *
 	mpz_ptr gmpnum_a, gmpnum_b, gmpnum_result;
 	gmp_temp_t temp_a, temp_b;
 
+	zval a_arg_2;
+	if (UNEXPECTED(is_operator && Z_TYPE_P(a_arg) == IS_NULL)) {
+		ZVAL_LONG(&a_arg_2, 0);
+		a_arg = &a_arg_2;
+	}
 	FETCH_GMP_ZVAL(gmpnum_a, a_arg, temp_a, is_operator ? 0 : 1);
 
 	if (gmp_ui_op && Z_TYPE_P(b_arg) == IS_LONG && Z_LVAL_P(b_arg) >= 0) {
 		gmpnum_b = NULL;
 		temp_b.is_used = 0;
 	} else {
+		zval b_arg_2;
+		if (UNEXPECTED(is_operator && Z_TYPE_P(b_arg) == IS_NULL)) {
+			ZVAL_LONG(&b_arg_2, 0);
+			b_arg = &b_arg_2;
+		}
 		FETCH_GMP_ZVAL_DEP(gmpnum_b, b_arg, temp_b, temp_a, is_operator ? 0 : 2);
 	}
 
diff --git a/ext/gmp/tests/overloading.phpt b/ext/gmp/tests/overloading.phpt
index 14c35ea8470c3..3a5f6c53e9073 100644
--- a/ext/gmp/tests/overloading.phpt
+++ b/ext/gmp/tests/overloading.phpt
@@ -11,6 +11,7 @@ $b = gmp_init(17);
 var_dump($a + $b);
 var_dump($a + 17);
 var_dump(42 + $b);
+var_dump($a + null);
 
 var_dump($a - $b);
 var_dump($a - 17);
@@ -136,6 +137,10 @@ object(GMP)#3 (1) {
   ["num"]=>
   string(2) "59"
 }
+object(GMP)#3 (1) {
+  ["num"]=>
+  string(2) "42"
+}
 object(GMP)#3 (1) {
   ["num"]=>
   string(2) "25"