diff --git a/tests/PHPStan/Analyser/nsrt/bug-11488.php b/tests/PHPStan/Analyser/nsrt/bug-11488.php
new file mode 100644
index 0000000000..2bbe2f5390
--- /dev/null
+++ b/tests/PHPStan/Analyser/nsrt/bug-11488.php
@@ -0,0 +1,90 @@
+<?php
+
+namespace Bug11488Nsrt;
+
+use function PHPStan\Testing\assertType;
+
+class Foo
+{
+	/**
+	 * @param array{mixed}|array{mixed, string|null, mixed} $row
+	 */
+	protected function test(array $row): string
+	{
+		if (count($row) !== 1) {
+			assertType('array{mixed, string|null, mixed}', $row);
+
+			[$field, $operator, $value] = $row;
+			assertType('string|null', $operator);
+		} else {
+			assertType('array{mixed}', $row);
+		}
+
+		if (count($row) === 1) {
+			assertType('array{mixed}', $row);
+		} else {
+			assertType('array{mixed, string|null, mixed}', $row);
+		}
+
+		if (count($row) === 2) {
+			assertType('*NEVER*', $row);
+		} else {
+			assertType('array{mixed, string|null, mixed}|array{mixed}', $row);
+		}
+
+		if (count($row) !== 2) {
+			assertType('array{mixed, string|null, mixed}|array{mixed}', $row);
+		} else {
+			assertType('*NEVER*', $row);
+		}
+
+		if (count($row) === 3) {
+			assertType('array{mixed, string|null, mixed}', $row);
+		} else {
+			assertType('array{mixed}', $row);
+		}
+
+		return '';
+	}
+
+	/**
+	 * @param array{bool}|array{mixed, string|null, mixed} $row
+	 */
+	protected function test2(array $row): string
+	{
+		if (count($row) !== 1) {
+			assertType('array{mixed, string|null, mixed}', $row);
+
+			[$field, $operator, $value] = $row;
+			assertType('string|null', $operator);
+		} else {
+			assertType('array{bool}', $row);
+		}
+
+		if (count($row) === 1) {
+			assertType('array{bool}', $row);
+		} else {
+			assertType('array{mixed, string|null, mixed}', $row);
+		}
+
+		if (count($row) === 2) {
+			assertType('*NEVER*', $row);
+		} else {
+			assertType('array{bool}|array{mixed, string|null, mixed}', $row);
+		}
+
+		if (count($row) !== 2) {
+			assertType('array{bool}|array{mixed, string|null, mixed}', $row);
+		} else {
+			assertType('*NEVER*', $row);
+		}
+
+		if (count($row) === 3) {
+			assertType('array{mixed, string|null, mixed}', $row);
+		} else {
+			assertType('array{bool}', $row);
+		}
+
+		return '';
+	}
+}
diff --git a/tests/PHPStan/Rules/Variables/NullCoalesceRuleTest.php b/tests/PHPStan/Rules/Variables/NullCoalesceRuleTest.php
index 7a92e20046..1833e4f681 100644
--- a/tests/PHPStan/Rules/Variables/NullCoalesceRuleTest.php
+++ b/tests/PHPStan/Rules/Variables/NullCoalesceRuleTest.php
@@ -362,6 +362,11 @@ public function testBug14213(): void
 		]);
 	}
 
+	public function testBug11488(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-11488.php'], []);
+	}
+
 	public function testBug13921(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-13921.php'], [
diff --git a/tests/PHPStan/Rules/Variables/data/bug-11488.php b/tests/PHPStan/Rules/Variables/data/bug-11488.php
new file mode 100644
index 0000000000..2e0086b71b
--- /dev/null
+++ b/tests/PHPStan/Rules/Variables/data/bug-11488.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Bug11488;
+
+class Foo
+{
+	/**
+	 * @param array{mixed}|array{mixed, string|null, mixed} $row
+	 */
+	protected function test(array $row): string
+	{
+		if (count($row) !== 1) {
+			[$field, $operator, $value] = $row;
+			return $operator ?? '=';
+		}
+
+		return '';
+	}
+}