diff --git a/plugins/grazie/src/test/kotlin/com/intellij/grazie/GrazieTestBase.kt b/plugins/grazie/src/test/kotlin/com/intellij/grazie/GrazieTestBase.kt
index 0c39a5b0e532..af8ac8369d3a 100644
--- a/plugins/grazie/src/test/kotlin/com/intellij/grazie/GrazieTestBase.kt
+++ b/plugins/grazie/src/test/kotlin/com/intellij/grazie/GrazieTestBase.kt
@@ -1,6 +1,7 @@
 // Copyright 2000-2019 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.grazie
 
+import com.intellij.codeInspection.LocalInspectionTool
 import com.intellij.grazie.grammar.LanguageToolChecker
 import com.intellij.grazie.ide.inspection.grammar.GrazieInspection
 import com.intellij.grazie.jlanguage.Lang
@@ -22,7 +23,7 @@ import kotlinx.coroutines.runBlocking
 
 abstract class GrazieTestBase : BasePlatformTestCase() {
   companion object {
-    val inspectionTools by lazy { arrayOf(GrazieInspection(), SpellCheckingInspection()) }
+    val inspectionTools: Array<out LocalInspectionTool> by lazy { arrayOf(GrazieInspection(), SpellCheckingInspection()) }
     val enabledLanguages = setOf(Lang.AMERICAN_ENGLISH, Lang.GERMANY_GERMAN, Lang.RUSSIAN, Lang.ITALIAN)
     val enabledRules = setOf("LanguageTool.EN.COMMA_WHICH", "LanguageTool.EN.UPPERCASE_SENTENCE_START")
   }
diff --git a/spellchecker/src/META-INF/SpellCheckerPlugin.xml b/spellchecker/src/META-INF/SpellCheckerPlugin.xml
index 795533594a82..487a3476c09a 100644
--- a/spellchecker/src/META-INF/SpellCheckerPlugin.xml
+++ b/spellchecker/src/META-INF/SpellCheckerPlugin.xml
@@ -24,7 +24,7 @@
     <localInspection shortName="SpellCheckingInspection" bundle="messages.SpellCheckerBundle"
                      key="spellchecking.inspection.name" groupKey="proofread" enabledByDefault="true" level="TYPO"
                      language=""
-                     implementationClass="com.intellij.spellchecker.inspections.SpellCheckingInspection"/>
+                     implementationClass="com.intellij.spellchecker.inspections.SpellCheckingInspection" dumbAware="true"/>
 
     <nameSuggestionProvider id="DictionarySuggestionProvider" implementation="com.intellij.spellchecker.quickfixes.DictionarySuggestionProvider" order="first"/>
     <severitiesProvider implementation="com.intellij.spellchecker.SpellCheckerSeveritiesProvider"/>
diff --git a/spellchecker/src/com/intellij/spellchecker/inspections/SpellCheckingInspection.java b/spellchecker/src/com/intellij/spellchecker/inspections/SpellCheckingInspection.java
index 40df512c4632..bf97345d711c 100644
--- a/spellchecker/src/com/intellij/spellchecker/inspections/SpellCheckingInspection.java
+++ b/spellchecker/src/com/intellij/spellchecker/inspections/SpellCheckingInspection.java
@@ -9,6 +9,8 @@ import com.intellij.lang.LanguageNamesValidation;
 import com.intellij.lang.injection.InjectedLanguageManager;
 import com.intellij.lang.refactoring.NamesValidator;
 import com.intellij.openapi.progress.ProgressManager;
+import com.intellij.openapi.project.DumbAware;
+import com.intellij.openapi.project.DumbService;
 import com.intellij.openapi.util.TextRange;
 import com.intellij.openapi.util.registry.Registry;
 import com.intellij.psi.PsiElement;
@@ -29,7 +31,7 @@ import java.util.Set;
 import static com.intellij.codeInspection.options.OptPane.checkbox;
 import static com.intellij.codeInspection.options.OptPane.pane;
 
-public final class SpellCheckingInspection extends LocalInspectionTool {
+public final class SpellCheckingInspection extends LocalInspectionTool implements DumbAware {
   public static final String SPELL_CHECKING_INSPECTION_TOOL_NAME = "SpellCheckingInspection";
 
   @Override
@@ -45,8 +47,9 @@ public final class SpellCheckingInspection extends LocalInspectionTool {
   }
 
   private static SpellcheckingStrategy getSpellcheckingStrategy(@NotNull PsiElement element, @NotNull Language language) {
+    DumbService dumbService = DumbService.getInstance(element.getProject());
     for (SpellcheckingStrategy strategy : LanguageSpellchecking.INSTANCE.allForLanguage(language)) {
-      if (strategy.isMyContext(element)) {
+      if (dumbService.isUsableInCurrentContext(strategy) && strategy.isMyContext(element)) {
         return strategy;
       }
     }
diff --git a/spellchecker/src/com/intellij/spellchecker/tokenizer/SpellcheckingStrategy.java b/spellchecker/src/com/intellij/spellchecker/tokenizer/SpellcheckingStrategy.java
index 6905e0880b64..fa8ec2e32b89 100644
--- a/spellchecker/src/com/intellij/spellchecker/tokenizer/SpellcheckingStrategy.java
+++ b/spellchecker/src/com/intellij/spellchecker/tokenizer/SpellcheckingStrategy.java
@@ -9,6 +9,7 @@ import com.intellij.lang.ParserDefinition;
 import com.intellij.openapi.extensions.ExtensionPointName;
 import com.intellij.openapi.fileTypes.FileType;
 import com.intellij.openapi.fileTypes.impl.CustomSyntaxTableFileType;
+import com.intellij.openapi.project.PossiblyDumbAware;
 import com.intellij.openapi.util.TextRange;
 import com.intellij.psi.*;
 import com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil;
@@ -18,7 +19,7 @@ import com.intellij.spellchecker.DictionaryLayer;
 import com.intellij.spellchecker.DictionaryLayersProvider;
 import com.intellij.spellchecker.inspections.PlainTextSplitter;
 import com.intellij.spellchecker.inspections.SpellCheckingInspection;
-import com.intellij.spellchecker.quickfixes.*;
+import com.intellij.spellchecker.quickfixes.SpellCheckerQuickFixFactory;
 import com.intellij.spellchecker.settings.SpellCheckerSettings;
 import com.intellij.util.KeyedLazyInstance;
 import org.jetbrains.annotations.NotNull;
@@ -32,8 +33,10 @@ import java.util.Set;
  * <p>
  * Register via extension point {@code com.intellij.spellchecker.support}
  * and override {@link #getTokenizer(PsiElement)} to skip/handle specific elements.
+ * <p>
+ * Mark your strategy as {@link com.intellij.openapi.project.DumbAware} if it does not need indexes to perform
  */
-public class SpellcheckingStrategy {
+public class SpellcheckingStrategy implements PossiblyDumbAware {
   protected final Tokenizer<PsiComment> myCommentTokenizer = new CommentTokenizer();
 
   public static final ExtensionPointName<KeyedLazyInstance<SpellcheckingStrategy>> EP_NAME =