diff --git a/src/PhpDoc/StubPhpDocProvider.php b/src/PhpDoc/StubPhpDocProvider.php
index 78247f4145..c00f41f735 100644
--- a/src/PhpDoc/StubPhpDocProvider.php
+++ b/src/PhpDoc/StubPhpDocProvider.php
@@ -29,7 +29,7 @@ class StubPhpDocProvider
 	/** @var array<string, array<string, ResolvedPhpDocBlock|null>> */
 	private $propertyMap = [];
 
-	/** @var array<string, array<string, ResolvedPhpDocBlock|null>> */
+	/** @var array<string, array<string, null>> */
 	private $methodMap = [];
 
 	/** @var array<string, ResolvedPhpDocBlock|null> */
@@ -162,7 +162,7 @@ public function findMethodPhpDoc(string $className, string $methodName, array $p
 				$parameterNameMapping[$methodParameterNames[$i]] = $parameterName;
 			}
 
-			return $this->methodMap[$className][$methodName] = $resolvedPhpDoc->changeParameterNamesByMapping($parameterNameMapping);
+			return $resolvedPhpDoc->changeParameterNamesByMapping($parameterNameMapping);
 		}
 
 		return null;
diff --git a/tests/PHPStan/Rules/Methods/MethodSignatureRuleTest.php b/tests/PHPStan/Rules/Methods/MethodSignatureRuleTest.php
index 978a8ca943..088c602cb2 100644
--- a/tests/PHPStan/Rules/Methods/MethodSignatureRuleTest.php
+++ b/tests/PHPStan/Rules/Methods/MethodSignatureRuleTest.php
@@ -190,4 +190,11 @@ public function testRuleWithStaticMethods(): void
 		]);
 	}
 
+	public function testBug2950(): void
+	{
+		$this->reportMaybes = true;
+		$this->reportStatic = true;
+		$this->analyse([__DIR__ . '/data/bug-2950.php'], []);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/Methods/data/bug-2950.php b/tests/PHPStan/Rules/Methods/data/bug-2950.php
new file mode 100644
index 0000000000..8e5c980034
--- /dev/null
+++ b/tests/PHPStan/Rules/Methods/data/bug-2950.php
@@ -0,0 +1,119 @@
+<?php
+
+namespace Bug2950;
+
+class BlockFactory
+{
+
+	/** @var \ArrayObject<int, int> */
+	private static $fullList = null;
+
+	public static function isRegistered(int $id): bool
+	{
+		$b = self::$fullList[$id << 4];
+		return $b !== null;
+	}
+}
+
+class Attribute
+{
+
+	public function getId(): int
+	{
+		return 0;
+	}
+
+	public function isSyncable(): bool
+	{
+		return false;
+	}
+
+	public function isDesynchronized(): bool
+	{
+		return false;
+	}
+
+	public function getValue(): float
+	{
+		return 0.0;
+	}
+
+	public function setValue(float $f) : self
+	{
+		return $this;
+	}
+}
+
+
+
+/**
+ * @phpstan-implements \ArrayAccess<int, float>
+ */
+class AttributeMap implements \ArrayAccess
+{
+
+	/** @var Attribute[] */
+	private $attributes = [];
+
+	public function addAttribute(Attribute $attribute): void
+	{
+		$this->attributes[$attribute->getId()] = $attribute;
+	}
+
+	public function getAttribute(int $id): ?Attribute
+	{
+		return $this->attributes[$id] ?? null;
+	}
+
+	/**
+	 * @return Attribute[]
+	 */
+	public function getAll(): array
+	{
+		return $this->attributes;
+	}
+
+	/**
+	 * @return Attribute[]
+	 */
+	public function needSend(): array
+	{
+		return array_filter($this->attributes, function(Attribute $attribute){
+			return $attribute->isSyncable() and $attribute->isDesynchronized();
+		});
+	}
+
+	/**
+	 * @param int $offset
+	 */
+	public function offsetExists($offset): bool
+	{
+		return isset($this->attributes[$offset]);
+	}
+
+	/**
+	 * @param int $offset
+	 */
+	public function offsetGet($offset): float
+	{
+		return $this->attributes[$offset]->getValue();
+	}
+
+	/**
+	 * @param int   $offset
+	 * @param float $value
+	 */
+	public function offsetSet($offset, $value): void
+	{
+		$this->attributes[$offset]->setValue($value);
+	}
+
+	/**
+	 * @param int $offset
+	 */
+	public function offsetUnset($offset): void
+	{
+		throw new \RuntimeException("Could not unset an attribute from an attribute map");
+	}
+
+}