diff --git a/ext/spl/spl_iterators.c b/ext/spl/spl_iterators.c
index 05bdfdb34ba3..a61195fb12d4 100644
--- a/ext/spl/spl_iterators.c
+++ b/ext/spl/spl_iterators.c
@@ -1541,7 +1541,8 @@ static inline void spl_dual_it_next(spl_dual_it_object *intern, int do_free)
 {
 	if (do_free) {
 		spl_dual_it_free(intern);
-	} else if (!intern->inner.iterator) {
+	}
+	if (!intern->inner.iterator) {
 		zend_throw_error(NULL, "The inner constructor wasn't initialized with an iterator instance");
 		return;
 	}
@@ -2692,7 +2693,7 @@ PHP_METHOD(NoRewindIterator, valid)
 	ZEND_PARSE_PARAMETERS_NONE();
 
 	SPL_FETCH_AND_CHECK_DUAL_IT(intern, ZEND_THIS);
-	RETURN_BOOL(intern->inner.iterator->funcs->valid(intern->inner.iterator) == SUCCESS);
+	RETURN_BOOL(spl_dual_it_valid(intern) == SUCCESS);
 } /* }}} */
 
 /* {{{ Return inner iterators key() */
@@ -2704,7 +2705,7 @@ PHP_METHOD(NoRewindIterator, key)
 
 	SPL_FETCH_AND_CHECK_DUAL_IT(intern, ZEND_THIS);
 
-	if (intern->inner.iterator->funcs->get_current_key) {
+	if (intern->inner.iterator && intern->inner.iterator->funcs->get_current_key) {
 		intern->inner.iterator->funcs->get_current_key(intern->inner.iterator, return_value);
 	} else {
 		RETURN_NULL();
@@ -2720,6 +2721,9 @@ PHP_METHOD(NoRewindIterator, current)
 	ZEND_PARSE_PARAMETERS_NONE();
 
 	SPL_FETCH_AND_CHECK_DUAL_IT(intern, ZEND_THIS);
+	if (!intern->inner.iterator) {
+		RETURN_NULL();
+	}
 	data = intern->inner.iterator->funcs->get_current_data(intern->inner.iterator);
 	if (data) {
 		RETURN_COPY_DEREF(data);
@@ -2734,6 +2738,10 @@ PHP_METHOD(NoRewindIterator, next)
 	ZEND_PARSE_PARAMETERS_NONE();
 
 	SPL_FETCH_AND_CHECK_DUAL_IT(intern, ZEND_THIS);
+	if (!intern->inner.iterator) {
+		zend_throw_error(NULL, "The inner constructor wasn't initialized with an iterator instance");
+		RETURN_THROWS();
+	}
 	intern->inner.iterator->funcs->move_forward(intern->inner.iterator);
 } /* }}} */
 
diff --git a/ext/spl/tests/gh25415.phpt b/ext/spl/tests/gh25415.phpt
new file mode 100644
index 000000000000..015e97ac8b12
--- /dev/null
+++ b/ext/spl/tests/gh25415.phpt
@@ -0,0 +1,69 @@
+--TEST--
+GH-25415 (Segfault in FilterIterator::next() after the subclass catches an exception from parent::__construct())
+--CREDITS--
+marinelay
+--FILE--
+<?php
+
+function g() { yield 1; }
+
+$gen = g();
+foreach ($gen as $v) {}
+
+$iterators = [
+    new class($gen) extends FilterIterator {
+        public function __construct(Iterator $it) {
+            try {
+                parent::__construct($it);
+            } catch (Exception $e) {
+                echo $e->getMessage(), "\n";
+            }
+        }
+        public function accept(): bool { return true; }
+    },
+    new class($gen) extends IteratorIterator {
+        public function __construct(Iterator $it) {
+            try {
+                parent::__construct($it);
+            } catch (Exception $e) {
+                echo $e->getMessage(), "\n";
+            }
+        }
+    },
+    new class($gen) extends NoRewindIterator {
+        public function __construct(Iterator $it) {
+            try {
+                parent::__construct($it);
+            } catch (Exception $e) {
+                echo $e->getMessage(), "\n";
+            }
+        }
+    },
+];
+
+foreach ($iterators as $it) {
+    var_dump($it->valid(), $it->key(), $it->current());
+    try {
+        $it->next();
+    } catch (Error $e) {
+        echo $e->getMessage(), "\n";
+    }
+}
+
+?>
+--EXPECT--
+Cannot traverse an already closed generator
+Cannot traverse an already closed generator
+Cannot traverse an already closed generator
+bool(false)
+NULL
+NULL
+The inner constructor wasn't initialized with an iterator instance
+bool(false)
+NULL
+NULL
+The inner constructor wasn't initialized with an iterator instance
+bool(false)
+NULL
+NULL
+The inner constructor wasn't initialized with an iterator instance