diff --git a/plugins/scripting/scripting-compiler-impl/src/org/jetbrains/kotlin/scripting/definitions/definitions.kt b/plugins/scripting/scripting-compiler-impl/src/org/jetbrains/kotlin/scripting/definitions/definitions.kt
index 72f8954cfad..460bfd71936 100644
--- a/plugins/scripting/scripting-compiler-impl/src/org/jetbrains/kotlin/scripting/definitions/definitions.kt
+++ b/plugins/scripting/scripting-compiler-impl/src/org/jetbrains/kotlin/scripting/definitions/definitions.kt
@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.scripting.definitions
 import com.intellij.ide.highlighter.JavaFileType
 import com.intellij.injected.editor.VirtualFileWindow
 import com.intellij.openapi.application.ApplicationManager
+import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.fileTypes.FileTypeRegistry
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.util.Computable
@@ -23,6 +24,7 @@ import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
 import kotlin.script.experimental.api.SourceCode
 
+
 inline fun <T> runReadAction(crossinline runnable: () -> T): T {
     return ApplicationManager.getApplication().runReadAction(Computable { runnable() })
 }
@@ -61,10 +63,15 @@ fun VirtualFile.findScriptDefinition(project: Project): ScriptDefinition? {
     return findScriptDefinition(project, VirtualFileScriptSource(this))
 }
 
-fun findScriptDefinition(project: Project, script: SourceCode): ScriptDefinition? {
+fun findScriptDefinition(project: Project, script: SourceCode): ScriptDefinition {
     val scriptDefinitionProvider = ScriptDefinitionProvider.getInstance(project)
         ?: error("Unable to get script definition: ScriptDefinitionProvider is not configured.")
     return scriptDefinitionProvider.findDefinition(script)
+        ?: scriptDefinitionProvider.getDefaultDefinition()
+            .also {
+                Logger.getInstance("org.jetbrains.kotlin.scripting.definitions")
+                    .debug("Default definition is used for ${script.locationId}")
+            }
 }
 
 private const val JAVA_CLASS_FILE_TYPE_DOT_DEFAULT_EXTENSION = ".class"
diff --git a/plugins/scripting/scripting-compiler/src/org/jetbrains/kotlin/scripting/compiler/plugin/services/FirScriptConfigurationExtensionImpl.kt b/plugins/scripting/scripting-compiler/src/org/jetbrains/kotlin/scripting/compiler/plugin/services/FirScriptConfigurationExtensionImpl.kt
index 4f191db7e5c..37b4fbe2d88 100644
--- a/plugins/scripting/scripting-compiler/src/org/jetbrains/kotlin/scripting/compiler/plugin/services/FirScriptConfigurationExtensionImpl.kt
+++ b/plugins/scripting/scripting-compiler/src/org/jetbrains/kotlin/scripting/compiler/plugin/services/FirScriptConfigurationExtensionImpl.kt
@@ -53,7 +53,10 @@ class FirScriptConfiguratorExtensionImpl(
         val sourceFile = fileBuilder.sourceFile ?: return
 
         val configuration = getOrLoadConfiguration(sourceFile)
-        check(configuration != null) { "Configuration for ${sourceFile.asString()} wasn't found" }
+            ?: run {
+                log.warn("Configuration for ${sourceFile.asString()} wasn't found. FirScriptBuilder wasn't configured.")
+                return
+            }
 
         // TODO: rewrite/extract decision logic for clarity
         configuration.getNoDefault(ScriptCompilationConfiguration.baseClass)?.let { baseClass ->
@@ -162,23 +165,16 @@ class FirScriptConfiguratorExtensionImpl(
 
     private fun KtSourceFile.asString() = path ?: name
 
-    private fun logConfiguration(file: KtSourceFile, config: ScriptCompilationConfiguration) {
-        log.debug(
-            "Using configuration: ${file.asString()} => " +
-                    "(${config[ScriptCompilationConfiguration.displayName]}, " +
-                    "ext=.${config[ScriptCompilationConfiguration.fileExtension]}, " +
-                    "pattern=${config[ScriptCompilationConfiguration.filePathPattern]})"
-        )
-    }
-
     private fun getOrLoadConfiguration(file: KtSourceFile): ScriptCompilationConfiguration? {
         val service = checkNotNull(session.scriptDefinitionProviderService)
         val sourceCode = file.toSourceCode()
         val ktFile = sourceCode?.originalKtFile()
-        return with(service) {
-            ktFile?.let { asKtFile -> configurationFor(asKtFile)?.also { logConfiguration(file, it) } }
-                ?: sourceCode?.let { asSourceCode -> configurationFor(asSourceCode)?.also { logConfiguration(file, it) } }
+        val configuration = with(service) {
+            ktFile?.let { asKtFile -> configurationFor(asKtFile) }
+                ?: sourceCode?.let { asSourceCode -> configurationFor(asSourceCode) }
+                ?: defaultConfiguration()?.also { log.debug("Default configuration loaded for ${file.asString()}") }
         }
+        return configuration
     }
 
     private fun buildContextReceiverWithFqName(classFqn: FqName, customName: Name? = null) =
@@ -202,7 +198,7 @@ class FirScriptConfiguratorExtensionImpl(
         get() = _knownAnnotationsForSamWithReceiver
 
     companion object {
-        private val log = Logger.getInstance(FirScriptConfiguratorExtensionImpl::class.java)
+        private val log: Logger get() = Logger.getInstance(FirScriptConfiguratorExtensionImpl::class.java)
 
         fun getFactory(hostConfiguration: ScriptingHostConfiguration): Factory {
             return Factory { session -> FirScriptConfiguratorExtensionImpl(session, hostConfiguration) }
@@ -222,6 +218,9 @@ private fun FirScriptDefinitionProviderService.configurationFor(file: KtFile): S
 private fun FirScriptDefinitionProviderService.configurationFor(sourceCode: SourceCode): ScriptCompilationConfiguration? =
     definitionProvider?.findDefinition(sourceCode)?.compilationConfiguration
 
+private fun FirScriptDefinitionProviderService.defaultConfiguration(): ScriptCompilationConfiguration? =
+    definitionProvider?.getDefaultDefinition()?.compilationConfiguration
+
 fun KtSourceFile.toSourceCode(): SourceCode? = when (this) {
     is KtPsiSourceFile -> (psiFile as? KtFile)?.let(::KtFileScriptSource) ?: VirtualFileScriptSource(psiFile.virtualFile)
     is KtVirtualFileSourceFile -> VirtualFileScriptSource(virtualFile)