PHP EA-103215 (!) CCE in XML suppressor called from other file

xml/xml-psi-api/src/com/intellij/codeInspection/DefaultXmlSuppressionProvider.java

@@ -1,17 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
  */
 
 package com.intellij.codeInspection;
@@ -56,6 +44,7 @@ public class DefaultXmlSuppressionProvider extends XmlSuppressionProvider implem
   @Override
   public void suppressForFile(@NotNull PsiElement element, @NotNull String inspectionId) {
     final PsiFile file = element.getContainingFile();
+    if (!(file instanceof XmlFile)) return;
     final XmlDocument document = ((XmlFile)file).getDocument();
     final PsiElement anchor = document != null ? document.getRootTag() : file.findElementAt(0);
     assert anchor != null;