diff --git a/ext/pdo_sqlite/sqlite_driver.c b/ext/pdo_sqlite/sqlite_driver.c
index 0ad30876261..6a41e2162a9 100644
--- a/ext/pdo_sqlite/sqlite_driver.c
+++ b/ext/pdo_sqlite/sqlite_driver.c
@@ -738,6 +738,9 @@ static const struct pdo_dbh_methods sqlite_methods = {
 
 static char *make_filename_safe(const char *filename)
 {
+	if (!filename) {
+		return NULL;
+	}
 	if (*filename && strncasecmp(filename, "file:", 5) == 0) {
 		if (PG(open_basedir) && *PG(open_basedir)) {
 			return NULL;
@@ -766,7 +769,7 @@ static int authorizer(void *autharg, int access_type, const char *arg3, const ch
 	char *filename;
 	switch (access_type) {
 		case SQLITE_ATTACH: {
-					filename = make_filename_safe(arg3);
+			filename = make_filename_safe(arg3);
 			if (!filename) {
 				return SQLITE_DENY;
 			}
diff --git a/ext/pdo_sqlite/tests/gh9032.phpt b/ext/pdo_sqlite/tests/gh9032.phpt
new file mode 100644
index 00000000000..332190484cf
--- /dev/null
+++ b/ext/pdo_sqlite/tests/gh9032.phpt
@@ -0,0 +1,24 @@
+--TEST--
+SQLite3 authorizer crashes on NULL values
+--EXTENSIONS--
+pdo_sqlite
+--INI--
+open_basedir=.
+--FILE--
+<?php
+$db = new PDO("sqlite::memory:", null, null, [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]);
+
+$db->exec('attach database \':memory:\' AS "db1"');
+var_dump($db->exec('create table db1.r (id int)'));
+
+try {
+$st = $db->prepare('attach database :a AS "db2"');
+$st->execute([':a' => ':memory:']);
+var_dump($db->exec('create table db2.r (id int)'));
+} catch (PDOException $ex) {
+    echo $ex->getMessage(), PHP_EOL;
+}
+?>
+--EXPECT--
+int(0)
+SQLSTATE[HY000]: General error: 23 not authorized
diff --git a/ext/sqlite3/sqlite3.c b/ext/sqlite3/sqlite3.c
index f06d373c56f..4126ddf73b2 100644
--- a/ext/sqlite3/sqlite3.c
+++ b/ext/sqlite3/sqlite3.c
@@ -2067,6 +2067,9 @@ static int php_sqlite3_authorizer(void *autharg, int action, const char *arg1, c
 	/* Check open_basedir restrictions first */
 	if (PG(open_basedir) && *PG(open_basedir)) {
 		if (action == SQLITE_ATTACH) {
+			if (!arg1) {
+				return SQLITE_DENY;
+			}
 			if (memcmp(arg1, ":memory:", sizeof(":memory:")) && *arg1) {
 				if (strncmp(arg1, "file:", 5) == 0) {
 					/* starts with "file:" */
diff --git a/ext/sqlite3/tests/gh9032.phpt b/ext/sqlite3/tests/gh9032.phpt
new file mode 100644
index 00000000000..069e0804064
--- /dev/null
+++ b/ext/sqlite3/tests/gh9032.phpt
@@ -0,0 +1,26 @@
+--TEST--
+SQLite3 authorizer crashes on NULL values
+--EXTENSIONS--
+sqlite3
+--INI--
+open_basedir=.
+--FILE--
+<?php
+$db = new SQLite3(":memory:");
+$db->enableExceptions(true);
+
+$db->exec('attach database \':memory:\' AS "db1"');
+var_dump($db->exec('create table db1.r (id int)'));
+
+try {
+    $st = $db->prepare('attach database :a AS "db2"');
+    $st->bindValue("a", ":memory:");
+    $st->execute();
+    var_dump($db->exec('create table db2.r (id int)'));
+} catch (Exception $ex) {
+    echo $ex->getMessage(), PHP_EOL;
+}
+?>
+--EXPECT--
+bool(true)
+Unable to prepare statement: 23, not authorized