diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/Fetch/ArrayFetchAnalyzer.php b/src/Psalm/Internal/Analyzer/Statements/Expression/Fetch/ArrayFetchAnalyzer.php
index 1f1db0be7..e6938e3d0 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/Fetch/ArrayFetchAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/Fetch/ArrayFetchAnalyzer.php
@@ -891,7 +891,7 @@ class ArrayFetchAnalyzer
 
                             $array_access_type = clone $type->previous_value_type;
                         } else {
-                            if ($type->sealed) {
+                            if ($type->sealed || !$context->inside_isset) {
                                 $object_like_keys = array_keys($type->properties);
 
                                 if (count($object_like_keys) === 1) {
diff --git a/src/Psalm/Internal/Analyzer/TypeAnalyzer.php b/src/Psalm/Internal/Analyzer/TypeAnalyzer.php
index d6ec1f0c6..0a5b036c5 100644
--- a/src/Psalm/Internal/Analyzer/TypeAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/TypeAnalyzer.php
@@ -1405,7 +1405,7 @@ class TypeAnalyzer
                 || $container_type_part instanceof THtmlEscapedString)
         ) {
             if ($input_type_part instanceof TLiteralString) {
-                return is_numeric($input_type_part->value);
+                return \is_numeric($input_type_part->value);
             }
             if ($atomic_comparison_result) {
                 $atomic_comparison_result->type_coerced = true;
diff --git a/src/Psalm/Internal/Visitor/OffsetShifterVisitor.php b/src/Psalm/Internal/Visitor/OffsetShifterVisitor.php
index 8b711812e..573a4b81e 100644
--- a/src/Psalm/Internal/Visitor/OffsetShifterVisitor.php
+++ b/src/Psalm/Internal/Visitor/OffsetShifterVisitor.php
@@ -27,7 +27,7 @@ class OffsetShifterVisitor extends PhpParser\NodeVisitorAbstract implements PhpP
      */
     public function enterNode(PhpParser\Node $node)
     {
-        /** @var array{startFilePos: int, endFilePos: int} */
+        /** @var array{startFilePos: int, endFilePos: int, startLine: int} */
         $attrs = $node->getAttributes();
 
         if ($cs = $node->getComments()) {
diff --git a/src/Psalm/Internal/Visitor/PartialParserVisitor.php b/src/Psalm/Internal/Visitor/PartialParserVisitor.php
index 3898cb088..f61176330 100644
--- a/src/Psalm/Internal/Visitor/PartialParserVisitor.php
+++ b/src/Psalm/Internal/Visitor/PartialParserVisitor.php
@@ -66,7 +66,7 @@ class PartialParserVisitor extends PhpParser\NodeVisitorAbstract implements PhpP
      */
     public function enterNode(PhpParser\Node $node, &$traverseChildren = true)
     {
-        /** @var array{startFilePos: int, endFilePos: int} */
+        /** @var array{startFilePos: int, endFilePos: int, startLine: int} */
         $attrs = $node->getAttributes();
 
         if ($cs = $node->getComments()) {
diff --git a/tests/ArrayAccessTest.php b/tests/ArrayAccessTest.php
index 218e5bcdd..9da527a5b 100644
--- a/tests/ArrayAccessTest.php
+++ b/tests/ArrayAccessTest.php
@@ -1144,6 +1144,18 @@ class ArrayAccessTest extends TestCase
                     }',
                 'error_message' => 'TypeDoesNotContainType',
             ],
+            'undefinedObjectLikeArrayOffset' => [
+                '<?php
+                    class Example {
+                        /**
+                         * @param array{a: string, b: int} $context
+                         */
+                        function foo(array $context): void {
+                            $context["c"];
+                        }
+                    }',
+                'error_message' => 'InvalidArrayOffset'
+            ],
         ];
     }
 }