From f559dd55abe9f0b01af0d81cdaf2854ffa5b357d Mon Sep 17 00:00:00 2001
From: "Aleksei.Cherepanov" <aleksei.cherepanov@jetbrains.com>
Date: Wed, 15 Nov 2023 19:17:09 +0100
Subject: [PATCH] Stop using IJ's maps in graph implementation of JPS

(cherry picked from commit 6f3204da0ab40ce034f8b946b0f8df62aabc54a5)
---
 .../jetbrains/kotlin/jps/targets/KotlinJvmModuleBuildTarget.kt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/jps/jps-plugin/src/org/jetbrains/kotlin/jps/targets/KotlinJvmModuleBuildTarget.kt b/jps/jps-plugin/src/org/jetbrains/kotlin/jps/targets/KotlinJvmModuleBuildTarget.kt
index 25fb049e5adbb..35b3de9328d47 100644
--- a/jps/jps-plugin/src/org/jetbrains/kotlin/jps/targets/KotlinJvmModuleBuildTarget.kt
+++ b/jps/jps-plugin/src/org/jetbrains/kotlin/jps/targets/KotlinJvmModuleBuildTarget.kt
@@ -381,6 +381,9 @@ class KotlinJvmModuleBuildTarget(kotlinContext: KotlinCompileContext, jpsModuleB
             val className = generatedClass.outputClass.className
             if (!cache.isMultifileFacade(className)) return emptySet()
 
+            // In case of graph implementation of JPS
+            if (previousMappings == null) return emptySet()
+
             val name = previousMappings.getName(className.internalName)
             return previousMappings.getClassSources(name).toSet()
         }