EA-46969

platform/analysis-api/src/com/intellij/lang/annotation/ProblemGroup.java

@@ -15,10 +15,13 @@
  */
 package com.intellij.lang.annotation;
 
+import org.jetbrains.annotations.Nullable;
+
 /**
  * Unique object, which is the same for all of the problems of some group.
  * It is used to split some inspection to several fake inspections
  */
 public interface ProblemGroup {
+  @Nullable
   String getProblemName();
 }

platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/HighlightInfo.java

@@ -766,7 +766,8 @@ public class HighlightInfo implements Segment {
       List<IntentionAction> options = myOptions;
       HighlightDisplayKey key = myKey;
       if (myProblemGroup != null) {
-        HighlightDisplayKey problemGroupKey = HighlightDisplayKey.findById(myProblemGroup.getProblemName());
+        String problemName = myProblemGroup.getProblemName();
+        HighlightDisplayKey problemGroupKey = problemName != null ? HighlightDisplayKey.findById(problemName) : null;
         if (problemGroupKey != null) {
           key = problemGroupKey;
         }