diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index 702c0718bfc..49462a40934 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<files psalm-version="dev-master@841cccd693a15da70c034a55eb05ee7ed8fdbc22">
+<files psalm-version="5.x-dev@9bc98ecd47a4b83a663783c5a4744d48605d3eba">
   <file src="examples/TemplateChecker.php">
     <PossiblyUndefinedIntArrayOffset>
       <code><![CDATA[$comment_block->tags['variablesfrom'][0]]]></code>
@@ -601,8 +601,6 @@
   <file src="src/Psalm/Type/Reconciler.php">
     <PossiblyUndefinedIntArrayOffset>
       <code>$const_name</code>
-      <code>$type[0]</code>
-      <code>$type[0][0]</code>
     </PossiblyUndefinedIntArrayOffset>
   </file>
   <file src="src/Psalm/Type/TypeNode.php">
diff --git a/src/Psalm/Type/Reconciler.php b/src/Psalm/Type/Reconciler.php
index 074ef233ab3..1ae92b40571 100644
--- a/src/Psalm/Type/Reconciler.php
+++ b/src/Psalm/Type/Reconciler.php
@@ -424,6 +424,10 @@ private static function addNestedAssertions(array $new_types, array $existing_ty
     {
         foreach ($new_types as $nk => $type) {
             if (strpos($nk, '[') || strpos($nk, '->')) {
+                $type = array_values($type);
+                if (!isset($type[0][0])) {
+                    continue;
+                }
                 if ($type[0][0] instanceof IsEqualIsset
                     || $type[0][0] instanceof IsIsset
                     || $type[0][0] instanceof NonEmpty