diff --git a/idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/ucache/ScriptClassRootsUpdater.kt b/idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/ucache/ScriptClassRootsUpdater.kt
index 5e7e43cfe77..c13ea6e52c6 100644
--- a/idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/ucache/ScriptClassRootsUpdater.kt
+++ b/idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/ucache/ScriptClassRootsUpdater.kt
@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.idea.core.script.ucache
 import com.intellij.codeInsight.daemon.DaemonCodeAnalyzer
 import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.application.runInEdt
+import com.intellij.openapi.components.service
 import com.intellij.openapi.fileEditor.FileEditorManager
 import com.intellij.openapi.progress.ProgressIndicator
 import com.intellij.openapi.progress.ProgressManager
@@ -27,6 +28,7 @@ import org.jetbrains.kotlin.idea.core.script.ScriptDependenciesModificationTrack
 import org.jetbrains.kotlin.idea.core.script.configuration.CompositeScriptConfigurationManager
 import org.jetbrains.kotlin.idea.core.script.scriptingDebugLog
 import org.jetbrains.kotlin.idea.core.util.EDT
+import org.jetbrains.kotlin.idea.util.FirPluginOracleService
 import org.jetbrains.kotlin.idea.util.application.runReadAction
 import org.jetbrains.kotlin.idea.util.application.runWriteAction
 import org.jetbrains.kotlin.psi.KtFile
@@ -243,6 +245,14 @@ abstract class ScriptClassRootsUpdater(
 
         if (openedScripts.isEmpty()) return
 
+        /**
+         * Scripts guts are everywhere in the plugin code, without them some functionality does not work,
+         * And with them some other fir plugin related is broken
+         * As FIR plugin does not have scripts support yet, just disabling not working one for now
+         */
+        @Suppress("DEPRECATION")
+        if (project.service<FirPluginOracleService>().isFirPlugin()) return
+
         GlobalScope.launch(EDT(project)) {
             if (project.isDisposed) return@launch
 
diff --git a/idea/idea-fir/src/org/jetbrains/kotlin/idea/util/FirPluginOracleServiceFirImpl.kt b/idea/idea-fir/src/org/jetbrains/kotlin/idea/util/FirPluginOracleServiceFirImpl.kt
new file mode 100644
index 00000000000..7c48b5a8c01
--- /dev/null
+++ b/idea/idea-fir/src/org/jetbrains/kotlin/idea/util/FirPluginOracleServiceFirImpl.kt
@@ -0,0 +1,11 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.util
+
+@Suppress("OverridingDeprecatedMember")
+class FirPluginOracleServiceFirImpl : FirPluginOracleService() {
+    override fun isFirPlugin(): Boolean = true
+}
\ No newline at end of file
diff --git a/idea/idea-frontend-independent/src/org/jetbrains/kotlin/idea/util/FirPluginOracle.kt b/idea/idea-frontend-independent/src/org/jetbrains/kotlin/idea/util/FirPluginOracle.kt
new file mode 100644
index 00000000000..e2cf5ce1b74
--- /dev/null
+++ b/idea/idea-frontend-independent/src/org/jetbrains/kotlin/idea/util/FirPluginOracle.kt
@@ -0,0 +1,11 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.util
+
+abstract class FirPluginOracleService {
+    @Deprecated("Should be used only as a very temporary solution to disable some FE1.0 functionality which is used in FIR plugin")
+    abstract fun isFirPlugin(): Boolean
+}
\ No newline at end of file
diff --git a/idea/resources-fir/META-INF/plugin.xml b/idea/resources-fir/META-INF/plugin.xml
index 47ca6a926f4..f4d4c1a2fd7 100644
--- a/idea/resources-fir/META-INF/plugin.xml
+++ b/idea/resources-fir/META-INF/plugin.xml
@@ -267,6 +267,11 @@ The Kotlin FIR plugin provides language support in IntelliJ IDEA and Android Stu
 <!--    <classesWithAnnotatedMembersSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinClassesWithAnnotatedMembersSearcher"/>-->
 <!--    <methodReferencesSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.DefaultAnnotationMethodKotlinImplicitReferenceSearcher"/>-->
 
+    <projectService serviceInterface="org.jetbrains.kotlin.idea.util.FirPluginOracleService"
+                    serviceImplementation="org.jetbrains.kotlin.idea.util.FirPluginOracleServiceFirImpl"/>
+
+
+
     <readWriteAccessDetector implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinReadWriteAccessDetector" id="kotlin"/>
 
 
diff --git a/idea/resources/META-INF/plugin-common.xml b/idea/resources/META-INF/plugin-common.xml
index 80d74c30e22..e802ce65eb8 100644
--- a/idea/resources/META-INF/plugin-common.xml
+++ b/idea/resources/META-INF/plugin-common.xml
@@ -290,6 +290,10 @@
     <projectService serviceInterface="org.jetbrains.kotlin.idea.search.KotlinSearchUsagesSupport"
                     serviceImplementation="org.jetbrains.kotlin.idea.search.KotlinSearchUsagesSupportImpl"/>
 
+    <projectService serviceInterface="org.jetbrains.kotlin.idea.util.FirPluginOracleService"
+                    serviceImplementation="org.jetbrains.kotlin.idea.util.FirPluginOracleServiceFE10Impl"/>
+
+
     <errorHandler implementation="org.jetbrains.kotlin.idea.reporter.KotlinReportSubmitter"/>
 
     <registryKey key="kotlin.dispatch.thread.resolve.check"
diff --git a/idea/src/org/jetbrains/kotlin/idea/util/FirPluginOracleServiceFE10Impl.kt b/idea/src/org/jetbrains/kotlin/idea/util/FirPluginOracleServiceFE10Impl.kt
new file mode 100644
index 00000000000..b2e423bcd58
--- /dev/null
+++ b/idea/src/org/jetbrains/kotlin/idea/util/FirPluginOracleServiceFE10Impl.kt
@@ -0,0 +1,11 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.util
+
+@Suppress("OverridingDeprecatedMember")
+class FirPluginOracleServiceFE10Impl : FirPluginOracleService() {
+    override fun isFirPlugin(): Boolean = false
+}
\ No newline at end of file