diff --git a/plugins/devkit/devkit-core/src/themes/ThemeJsonSchemaProviderFactory.java b/plugins/devkit/devkit-core/src/themes/ThemeJsonSchemaProviderFactory.java
index 8897695078dc..8caaaa7fbd58 100644
--- a/plugins/devkit/devkit-core/src/themes/ThemeJsonSchemaProviderFactory.java
+++ b/plugins/devkit/devkit-core/src/themes/ThemeJsonSchemaProviderFactory.java
@@ -9,6 +9,7 @@ import com.jetbrains.jsonSchema.extension.JsonSchemaProviderFactory;
 import com.jetbrains.jsonSchema.extension.SchemaType;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.idea.devkit.util.PsiUtil;
 
 import java.util.Collections;
 import java.util.List;
@@ -22,6 +23,10 @@ public class ThemeJsonSchemaProviderFactory implements JsonSchemaProviderFactory
   @NotNull
   @Override
   public List<JsonSchemaFileProvider> getProviders(@NotNull Project project) {
+    if (!PsiUtil.isPluginProject(project)) {
+      return Collections.emptyList();
+    }
+
     return Collections.singletonList(new JsonSchemaFileProvider() {
       @Override
       public boolean isAvailable(@NotNull VirtualFile file) {