diff --git a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/InspectionRunner.java b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/InspectionRunner.java
index f6aa1465249b..bf816b9d4dbe 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/InspectionRunner.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/InspectionRunner.java
@@ -88,7 +88,7 @@ class InspectionRunner {
                            // The containing file this tool was called for. In the case of injected context, this will be the injected file.
                            @NotNull PsiFile psiFile) {
     @Override
-    public String toString() {
+    public @NotNull String toString() {
       return tool +"; inside:"+elementsInside().size()+"; outside:"+elementsOutside().size();
     }
   }
@@ -403,15 +403,22 @@ class InspectionRunner {
    * (starting from this inspection's most fertile elements if any),
    * maintaining parallelism during this process (i.e., several visitors from {@code init} can be executed concurrently, but elements from the list head get higher priority than the list tail).
    */
-  private static void processContext(@NotNull InspectionContext context, List<? extends PsiElement> psiElements,
+  private static void processContext(@NotNull InspectionContext context,
+                                     @NotNull @Unmodifiable List<? extends PsiElement> psiElements,
                                      @NotNull InspectionVisitorOptimizer optimizer) {
     if (LOG.isTraceEnabled()) {
       LOG.trace("processContext: " +
                 context + "; elements(" + psiElements.size() + "): " + StringUtil.join(psiElements, e-> e + "(" + e.getClass() + ")", ", ") + "; accepts=" + context.acceptingPsiTypes());
     }
-    optimizer.acceptElements(psiElements,
-                             context.acceptingPsiTypes,
-                             psiElement -> context.holder.visitElement(psiElement, context.visitor));
+    try {
+      optimizer.acceptElements(psiElements,
+                               context.acceptingPsiTypes,
+                               psiElement -> context.holder.visitElement(psiElement, context.visitor));
+    }
+    catch (Throwable t) {
+      if (Logger.shouldRethrow(t)) throw t;
+      LOG.error(t);
+    }
   }
 
   private void injectedFound(@NotNull PsiFile injectedPsi, @NotNull PsiElement host, @NotNull LocalInspectionToolSession session,